CN113327117A

CN113327117A - Asset tracing method and device based on block chain and electronic equipment

Info

Publication number: CN113327117A
Application number: CN202110536160.8A
Authority: CN
Inventors: 陆旭明
Original assignee: Advanced New Technologies Co Ltd
Current assignee: Alibaba Group Holding Ltd; Advanced New Technologies Co Ltd
Priority date: 2019-01-03
Filing date: 2019-01-03
Publication date: 2021-08-31
Also published as: CN110020948A; CN110020948B

Abstract

An asset tracing method based on a block chain is applied to an asset transfer system built based on the block chain; the asset circulation system comprises an asset publisher and a multi-level asset holder; a first level asset holder of the multi-level asset holders holding a first asset object created based on a first payback between the asset issuer and the first level asset holder; the first asset object is split based on accounts payable between a first-level asset holder and a lower-level asset holder and then transferred to the lower-level asset holder; the method comprises the following steps: receiving a traceability request for a target asset object held by any one of a plurality of levels of asset holders; inquiring asset creating records and asset circulation records which are stored on the block chain and are related to the target asset object; and tracing the target asset object based on the found asset creating record and the asset transferring record, and determining a source asset object which is split into the target asset object and accounts payable corresponding to the source asset object.

Description

Asset tracing method and device based on block chain and electronic equipment

Technical Field

One or more embodiments of the present disclosure relate to the field of blockchain technologies, and in particular, to an asset tracing method and apparatus based on blockchain, and an electronic device.

Background

The block chain technology, also called distributed ledger technology, is an emerging technology in which several computing devices participate in "accounting" together, and a complete distributed database is maintained together. The blockchain technology has been widely used in many fields due to its characteristics of decentralization, transparency, participation of each computing device in database records, and rapid data synchronization between computing devices.

Disclosure of Invention

The specification also provides an asset tracing method based on the block chain, which is applied to an asset transfer system built based on the block chain; the asset circulation system comprises an asset publisher and a multi-level asset holder; a first level asset holder of the multi-level asset holders holding a first asset object created based on a first payback between the asset issuer and the first level asset holder; wherein the first asset object is split based on accounts payable between the first level asset holder and a subordinate asset holder and then transferred to the subordinate asset holder; the method comprises the following steps:

receiving a traceability request for a target asset object held by any one of the multi-level asset holders;

inquiring asset creating records and asset circulation records which are stored on the blockchain and are related to the target asset object in response to the source tracing request; wherein the asset creation record comprises a correspondence between accounts payable and an asset object; the asset circulation record comprises the corresponding relation among an asset object, an asset object split from the asset object and a lower-level asset holder holding the split asset object;

tracing the target asset object based on the found asset creating record and asset circulation record, and determining a source asset object of the target asset object; and accounts payable corresponding to the source asset object.

Optionally, the method further includes:

receiving a first transaction sent by the first level asset holder; the first transaction comprises a second accounts payable between the first level asset holder and a second level asset holder of the plurality of levels of asset holders;

and responding to the first transaction, matching the first accounts payable with the second accounts payable, calling an asset splitting logic declared in an intelligent contract issued on the blockchain when the amount of the second accounts payable is not greater than the amount of the first accounts payable, splitting the first asset object, splitting a second asset object matched with the second accounts payable from the first asset object, and transferring the split second asset object to the second-level asset holder for holding.

Optionally, the method further includes:

after splitting a second asset object matched with the second account payable from the first asset object, generating an asset creating record corresponding to the second asset object, and issuing the generated asset creating record to a block chain for evidence storage; wherein the asset creation record comprises a correspondence of the second asset object with the second payable payment;

after the second asset object which is split is transferred to the second-level asset holder for holding, generating an asset circulation record corresponding to the first asset object, and issuing the generated asset circulation record to a block chain for storage; wherein the asset transition record comprises a correspondence between the first asset object, the second asset object split from the first asset object, and a second asset holder holding the second asset object.

Optionally, the method further includes:

and if the amount of the second accounts payable is greater than the amount of the first accounts payable, returning an asset transfer failure notification message to the first-level asset holder.

Optionally, before the splitting process is performed on the first asset object, the method further includes:

determining whether the block chain has credited the second accounts payable created by the first level asset holder for the second level asset holder and authorized by the second level asset holder; and if so, further splitting the first asset object.

Optionally, the method further includes:

receiving a second transaction sent by the asset publisher; the second transaction comprises the first account payable;

in response to the second transaction, invoking asset creation logic declared in a smart contract issued on the blockchain, creating the first asset object based on the first payoff payment, and transferring the created first asset object to the first level asset holder for holding; and the number of the first and second groups,

after the first asset object is created based on the first pay account, generating an asset creation record corresponding to the first asset object, and issuing the generated asset creation record to a blockchain for evidence deposit; wherein the asset creation record includes a correspondence between the first accounts payable and the first asset object.

Optionally, before creating the first asset object based on the first payoff, the method further includes:

determining whether the blockchain has a proof of the first payable charge created by the asset publisher for the first level asset holder and validated by the first level asset holder; if so, the first asset object is created further based on the first payoff account.

Optionally, the asset transfer system is a supply chain financial system; the supply chain financial system comprises a core enterprise as an asset publisher, a multi-level supplier as an asset holder, and a financial institution; wherein the property object is used to initiate a financing loan to the financial institution.

Optionally, the method further includes:

receiving a third transaction sent by any target supplier in the multi-stage suppliers; the third transaction comprises a third property object for initiating a financing loan to the financial institution;

and in response to the third transaction, transferring the third asset object to the financial institution for holding, so that the financial institution converts the asset amount of the third asset object into a fund limit after confirming the right of a third account payable corresponding to the third asset object, and issues a loan to the supplier based on the converted fund limit.

The specification also provides an asset tracing device based on the block chain, which is applied to an asset transfer system built based on the block chain; the asset circulation system comprises an asset publisher and a multi-level asset holder; a first level asset holder of the multi-level asset holders holding a first asset object created based on a first payback between the asset issuer and the first level asset holder; wherein the first asset object is split based on accounts payable between the first level asset holder and a subordinate asset holder and then transferred to the subordinate asset holder; the device comprises:

a receiving module, which receives a source tracing request aiming at a target asset object held by any one of the multi-stage asset holders;

the searching module is used for responding to the source tracing request and inquiring the asset creating record and the asset circulation record which are stored on the block chain and are related to the target asset object; wherein the asset creation record comprises a correspondence between accounts payable and an asset object; the asset circulation record comprises the corresponding relation among an asset object, an asset object split from the asset object and a lower-level asset holder holding the split asset object;

the source tracing module is used for tracing the target asset object based on the searched asset creating record and asset circulation record and determining a source asset object of the target asset object; and accounts payable corresponding to the source asset object.

Optionally, the receiving module further:

the device further comprises:

and the splitting module is used for responding to the first transaction, matching the first accounts payable with the second accounts payable, calling asset splitting logic declared in an intelligent contract issued on the block chain when the amount of the second accounts payable is not greater than the amount of the first accounts payable, splitting the first asset object, splitting a second asset object matched with the second accounts payable from the first asset object, and transferring the split second asset object to the second-level asset holder for holding.

Optionally, the apparatus further comprises:

the generating module is used for generating an asset creating record corresponding to a second asset object after the second asset object matched with the second account payment is split from the first asset object, and issuing the generated asset creating record to a block chain for evidence storage; wherein the asset creation record comprises a correspondence of the second asset object with the second payable payment;

Optionally, the splitting module further:

before the first asset object is split, determining whether the block chain stores the second accounts payable which is created by the first-level asset holder for the second-level asset holder and determined by the second-level asset holder; and if so, further splitting the first asset object.

Optionally, the receiving module further:

the device further comprises:

a creation module that invokes asset creation logic declared in a smart contract issued on the blockchain in response to the second transaction, creates the first asset object based on the first payoff, and transfers the created first asset object to the first level asset holder for holding; and the number of the first and second groups,

Optionally, the creating module further:

determining whether the blockchain has a proof of the first payable payment created by the asset publisher for the first level asset holder and after the first level asset holder has determined rights before creating the first asset object based on the first payable payment; if so, the first asset object is created further based on the first payoff account.

Optionally, the receiving module further:

the device further comprises:

and the transfer module responds to the third transaction, transfers the third asset object to the financial institution for holding, so that the financial institution converts the asset amount of the third asset object into a fund amount after confirming the third account payable corresponding to the third asset object, and sends a loan to the supplier based on the converted fund amount.

This specification also proposes an electronic device including:

a processor;

a memory for storing machine executable instructions;

wherein, by reading and executing machine executable instructions stored by the memory corresponding to control logic for blockchain-based asset tracing, the processor is caused to:

receiving a trading order submitted by a user client connected to a local trading center;

sending the received trading orders to other trading centers in the block chain; receiving trade orders which are sent by other trading centers and submitted by user clients connected to other trading centers;

performing transaction matching processing on the received transaction orders to generate a transaction entrusted ledger, and sending the generated transaction entrusted ledger to other transaction centers in the block chain; receiving a transaction entrusted account book which is sent by each other transaction center and generated by the other transaction centers performing transaction matching processing on the received transaction orders; the transaction entrusted account book comprises a transaction order which is generated based on transaction order matching;

and initiating consensus processing on the transaction entrusted ledger generated by each transaction center, and executing the transaction orders in the transaction entrusted ledger passing the consensus.

Drawings

FIG. 1 is a flow chart of a blockchain-based asset tracing method according to an exemplary embodiment.

Fig. 2 is a schematic structural diagram of an electronic device according to an exemplary embodiment.

Fig. 3 is a block diagram of an asset tracing apparatus based on a blockchain according to an exemplary embodiment.

Detailed Description

In the description, the purpose is to provide an asset transfer system which is built based on a block chain and consists of an asset publisher and a plurality of levels of asset holders, the accounts payable between the asset publisher and a first level of asset holder can be continuously split in the form of digital assets based on the accounts payable between the first asset holder and a lower level of asset holder, and then the accounts payable is transferred to the lower level of asset holder; in addition, any one of the multi-level asset holders can trace the assets of the held target asset object to clearly split the source asset object of the target asset object; and an accounts payable technical solution corresponding to the source asset object.

In implementation, the asset publisher may construct a transaction based on a first accounts payable with a first level asset holder of the plurality of levels of asset holders, publish the transaction in a blockchain, invoke a smart contract deployed on the blockchain, create a first asset object based on the first accounts payable, and transfer the created first asset object to the first level asset holder for holding.

After receiving the transaction, the node device in the blockchain can respond to the transaction, call asset creation logic declared in the intelligent contract issued on the blockchain, create the first asset object based on the first payment account, and transfer the created first asset object to the first-level asset holder for holding; after the first asset object is created based on the first payment account, generating an asset creation record corresponding to the first asset object, and issuing the generated asset creation record to a blockchain for evidence deposit; wherein the asset creation record includes a correspondence between the first account payable and the first asset object

The first-level asset holder may construct a transaction based on a second accounts payable with a second-level asset holder of the multi-level asset holders, and issue the transaction in the blockchain to invoke an intelligent contract deployed on the blockchain to complete the split transfer for the first asset object.

After receiving the transaction, the node device in the blockchain may respond to the transaction and match the first accounts payable with the second accounts payable; if the matching result indicates that the amount of the second accounts payable is not greater than the amount of the first accounts payable, an asset splitting logic declared in an intelligent contract issued on a blockchain may be invoked, the first asset object may be split, a second asset object matching the second accounts payable may be split from the first asset object, and the split second asset object may be transferred to the second level asset holder for holding.

After splitting a second asset object matched with the second account payable from the first asset object, generating an asset creating record corresponding to the second asset object, and issuing the generated asset creating record to a blockchain for evidence storage; wherein the asset creation record includes a correspondence between the second asset object and the second payable payment;

after the second asset object which is split is transferred to the second-level asset holder for holding, an asset circulation record corresponding to the first asset object can be generated, and the generated asset circulation record is issued to the block chain for storage; the asset circulation record includes a corresponding relationship among the first asset object, the second asset object split from the first asset object, and a second asset holder holding the second asset object.

Further, the second-level asset holder may perform the same operation as the first-level asset holder, continue to construct a transaction based on a third payable account with a third-level asset holder of the multi-level asset holders, and issue the transaction in a blockchain to call an intelligent contract deployed on the blockchain, complete the split transfer of the second asset object, generate a corresponding asset transfer record, and record the asset transfer on the blockchain for evidence storage; by analogy, the held asset objects can be continuously split and then transferred to the lower-level asset holder, and corresponding asset creating records and asset circulation records are stored on the block chain.

For any one of the multi-level asset holders, asset tracing processing may be performed on the held target asset object by sending a tracing request to the node devices in the block chain.

When receiving a tracing request for the target asset object, the node device in the block chain can respond to the tracing request, inquire asset creating records and asset circulation records which are stored on the block chain and are related to the target asset object, then perform tracing processing on the target asset object based on the found asset creating records and asset circulation records, and determine a source asset object for splitting the target asset object; and accounts payable corresponding to the source asset object.

Through the technical scheme, on one hand, the first account payable between the asset issuer and the first-level asset holder can be continuously transferred to the lower-level asset holder after being continuously split in the form of digital assets based on the account payable between the first asset holder and the lower-level asset holder; therefore, under the condition that the first payable account between the asset issuing party and the first-level asset holder is not yet honored, the second payable account between each level of asset holder and the higher-level asset holder can be taken as the digital asset and continuously transferred to the lower-level asset holder to replace the circulation of the fund, so that the influence on the normal operation of the lower-level asset holder caused by the fact that the payable account between the higher-level asset holder and the asset issuing party is not yet honored can be reduced to the greatest extent.

On the other hand, for any one of the multi-level asset holders, the source asset object of the target asset object can be definitely split by performing asset tracing processing on the held target asset object based on the asset creation record and the asset transfer record certified on the block chain; and accounts payable corresponding to the source asset object, so that the source and circulation process of the held target asset object can be confirmed.

The present specification is described below with reference to specific embodiments and specific application scenarios.

Referring to fig. 1, fig. 1 is a block chain-based asset transfer method provided in an embodiment of the present specification, which is applied to an asset circulation system built based on a block chain; the asset circulation system comprises an asset publisher and a multi-level asset holder; wherein a first level asset holder of the multi-level asset holders holds a first asset object created based on a first payback between the asset issuer and the first level asset holder; the first asset object is split based on accounts payable between the first level asset holder and a lower level asset holder and then transferred to the lower level asset holder; the following steps are carried out:

102, a node device in a block chain receives a source tracing request aiming at a target asset object held by any one level asset holder in the multi-level asset holders;

step 104, responding to the source tracing request, and inquiring asset creating records and asset circulation records which are stored on the block chain and are related to the target asset object; wherein the asset creation record comprises a correspondence between accounts payable and an asset object; the asset circulation record comprises the corresponding relation among an asset object, an asset object split from the asset object and a lower-level asset holder holding the split asset object;

step 106, tracing the target asset object based on the found asset creating record and asset circulation record, and determining a source asset object of the target asset object; and accounts payable corresponding to the source asset object.

The blockchain described in this specification may specifically include any type of blockchain network that can encompass asset objects in the supported objects.

For example, in a traditional blockchain, the supported objects typically include only account objects and contract objects (i.e., smart contracts), whereas in this specification, the supported objects of the blockchain may be extended to further extend an asset object based on existing support of the blockchain, such as the account objects and the contract objects.

It should be noted that the type of the block chain described in this specification is not particularly limited, and may be a private chain, a public chain, a federation chain, or the like;

for example, in one scenario, the block chain may be a federation chain consisting of an asset publisher and multiple levels of asset holders as federation members. The operator of the alliance chain can build an asset circulation system which is composed of an asset publisher and a plurality of stages of asset holders based on the alliance chain, and accounts payable between the asset publisher and the plurality of stages of asset holders is taken as digital assets to be circulated in the asset circulation system.

The intelligent contract is also referred to as a contract object in the blockchain based on the account model, and may specifically include an intelligent contract program issued by a target member in the blockchain, and included in a distributed database (i.e., a blockchain ledger) of the blockchain, for managing asset objects supported by the blockchain. The user accessing the blockchain can create a piece of asset object on the blockchain by calling the intelligent contract, and complete the online management and transfer of the held asset object on the blockchain.

The Transaction (Transaction) described in this specification refers to a piece of data that is created by a client of the blockchain and needs to be finally published to a distributed database of the blockchain.

Transactions in a blockchain, generally have a narrow sense of transaction and a broad sense of transaction score. A narrowly defined transaction refers to a transfer of value issued by a user to a blockchain; for example, in a conventional bitcoin blockchain network, the transaction may be a transfer initiated by the user in the blockchain. The broad transaction refers to a piece of business data with business intention, which is issued to the blockchain by a user; for example, an operator may build a federation chain based on actual business requirements, relying on the federation chain to deploy some other types of online businesses unrelated to value transfer (e.g., anti-counterfeit verification business, house renting business, vehicle dispatching business, insurance claim settlement business, credit service, medical service, etc.), and in such federation chain, the transaction may be a business message or business request with a business intention issued by a user in the federation chain.

The asset object can correspond to any type of real asset of a user in the real world; alternatively, other forms of objects capable of being flow transferred as digital assets;

for example, the asset object may specifically be real assets such as funds, real property, stock, etc., or data suitable for being packaged into digital assets for circulation transfer such as loan contracts, bills, accounts payable, etc.

The technical solution of the present specification is described in detail below by taking the above asset transfer system as an example of a supply chain financial system built based on a block chain.

Wherein, it should be emphasized that the supply chain financial system built by taking the above asset circulation system as a block chain is only exemplary and is not used to limit the technical solution of the present specification; obviously, in practical application, a person skilled in the art can flexibly construct the asset transfer system based on actual requirements.

In the present specification, in the above supply chain financial system, a core enterprise as an asset issuing party, a multi-level supplier as an asset holding party, and a financial institution (such as a bank) may be included.

The core enterprise can create a first asset object for a first-stage supplier based on a first account payable before the first account payable between the core enterprise and the first-stage supplier in the multi-stage suppliers is not redeemed, and the first asset object is held by the first-stage supplier;

the first-level provider may split the first asset object based on a second accounts payable with a second-level provider of the multi-level providers, split a second asset object matching the second accounts payable from the first asset object, and transfer the split second asset object to the second-level provider for holding.

The second-level supplier in the multi-level suppliers may perform the same action as the first-level supplier, continue to split the second asset object based on a third payable account with the third-level supplier, continue to transfer the split asset object to the lower-level supplier, and so on, and finally, the first asset object may continuously transfer to the lower-level supplier based on the debt relationship between the suppliers at all levels.

The financial institution can provide financing service for suppliers of all levels. For any level of suppliers, when the first payable fund expires, the corresponding amount of payable fund can be charged to the core enterprise based on the amount of the held asset object; alternatively, the held asset object may be transferred to the financial institution to initiate financing to the financial institution before the first payable payment expires.

The operator of the block chain can expand the objects supported by the block chain when building the block chain network.

In a traditional blockchain (e.g., etherhouse), the objects supported by the blockchain typically include only two classes, an account object and a contract object (i.e., a smart contract). In the present specification, the object supported by the blockchain may be extended, and an asset object may be further extended on the basis of the existing account object and contract object.

That is, in this specification, the objects supported by the above block chain may include three classes, i.e., an account object, a contract object, and an asset object. In this way, after the core enterprise, the multi-level supplier and the financial institution join the blockchain as the blockchain member node, besides the creation of the account and the intelligent contract can be completed on the blockchain, a digital asset can also be created on the blockchain.

In this description, the core enterprise may develop in advance an intelligent contract (which may of course be developed by the operator of the block chain, or a third party) for managing the asset objects, and declare executable logic (e.g., executable functions, code, etc.) for managing the asset objects in the intelligent contract.

In this specification, the executable logic declared in the intelligent contract may specifically include asset creation logic for creating an asset object, asset splitting logic for splitting the asset object, asset liquidation logic for liquidating the asset object, and the like.

Of course, in practical applications, those skilled in the art may declare other forms of executable logic in the smart contract besides the asset creation logic, the asset splitting logic and the asset liquidation logic based on actual business requirements, and are not particularly limited in this specification.

After the core enterprise completes the development of the intelligent contract, the developed intelligent contract can be issued in a block chain in a transaction form; after receiving the transaction, the node device in the blockchain may perform consensus on the transaction based on a consensus algorithm supported by the blockchain, and after the consensus passes, record the intelligent contract into a distributed database of the blockchain to complete deployment of the intelligent contract.

The consensus process performed by the node device in the blockchain on the received transaction is not described in detail in this specification, and those skilled in the art may refer to the description in the related art.

After the intelligent contracts are deployed in the blockchain, the core enterprises, the multi-level suppliers and the financial institutions in the supply chain financial system can call the executable logic declared in the intelligent contracts by issuing a transaction form to the blockchain to complete the operations of creating, splitting and the like of the asset objects.

In one embodiment, the core enterprise may create a first payment account for a first-level provider based on a debt relationship with the first-level provider, sign the created first payment account based on a held private key, send the signed first payment account to the first-level provider, and perform a right confirmation process by the first provider.

The right confirmation processing is to confirm the right to collect accounts corresponding to the accounts payable; in practical application, the accounts payable can be signed by the held private key, so that the collection right of the accounts payable corresponding to the accounts payable can be confirmed.

After receiving a first payment account created by the core enterprise for the first-level provider, the first-level provider may verify a private key of the first payment account based on a public key corresponding to the private key held by the core enterprise, sign the first payment account based on the private key held by the first-level provider after the verification is passed, complete a confirmation process for the first payment account, and then issue the first payment account after the confirmation in a transaction form in a blockchain for a verification process.

Correspondingly, for the first-level provider, a second accounts payable may be created for the second-level provider based on the debt relationship with the second-level provider in the multi-level provider, the created second accounts payable may be sent to the second-level provider, the second-level provider performs the authorization, and then the second information payable after the authorization is issued in the blockchain for the evidence saving process, and so on.

In this way, any one of the multi-level suppliers can create accounts payable for the lower-level supplier based on the debt relationship with the lower-level supplier, send the created accounts payable to the lower-level supplier for confirmation, and then deposit the accounts payable on the blockchain.

In this specification, before the first payable account is redeemed, the core enterprise may construct a transaction for creating an asset object based on the first payable account, carry the first payable account in the transaction, and issue the transaction on the blockchain to invoke the deployed smart contract, thereby creating a first asset object for the first-level provider;

in an example, the first accounts payable carried in the transaction may specifically be data content of the first accounts payable, or may be only identification information of the first accounts payable; for example, a hash value obtained by performing a hash calculation on the data content of the first account payable.

And after receiving the transaction sent by the core enterprise, the node equipment in the blockchain can respond to the transaction, perform consensus processing on the transaction, call asset creation logic declared in the intelligent contract deployed in the blockchain after the consensus is passed, and create a first asset object based on the first payment account.

In an embodiment shown, before invoking the asset creation logic declared in the intelligent contract deployed in the blockchain and creating the first asset object based on the first payment account, the node device may further search data stored in the blockchain to determine whether the first payment account created by the core enterprise for the first-level provider and provided with the first-level supply right currently exists on the blockchain; if so, verifying that the collection right of the first accounts payable has been transferred to the first level provider, and then creating the first asset object based on the first accounts payable.

In this way, before the first payable creates the first asset object for the first-level provider, the first payable is checked to see whether the first payable is an actual payable that is authorized by the first-level provider, so that the loss of creating the asset object for the first-level provider based on the payable that is false or that the first-level provider does not have the right to collect can be avoided.

In an embodiment shown in the present disclosure, when invoking an asset creating logic declared in the intelligent contract deployed in the blockchain, and creating a first asset object based on the first payment account, the node device may specifically obtain an amount of the first payment account, convert the amount of the first payment account into an asset amount according to a preset conversion rule, and create an asset object equal to the converted asset amount, so as to obtain the first asset object. The conversion rule is not particularly limited in the present specification; for example, the conversion may be an equal conversion or a non-equal conversion.

After the node device creates the first asset object based on the first payable account by calling the asset creation logic stated in the smart contract, the created first asset object may be transferred to the first-level provider (i.e., the owed party of the first accounts payable) for holding.

For example, asset objects created by smart contracts, when implemented, will typically have unique address information; in this case, the created first asset object is transferred to the first-level provider, that is, a process of adding address information of the first asset object to an account object corresponding to the first-level provider on the blockchain.

Further, after completing the creation of the first asset object or transferring the first asset object to the first-level asset holder for holding, the node device may further generate an asset creation record corresponding to the first asset object, and issue the generated asset creation record to the blockchain for storage. Wherein, the asset creating record corresponding to the first asset object comprises the corresponding relation between the first account payable and the first asset object.

In this specification, the first-level provider may also construct a transaction for transferring an asset object based on a second accounts payable with a second-level provider of the multiple-level providers before the first accounts payable is redeemed, the second accounts payable is carried in the transaction, the transaction is issued on a blockchain, a deployed smart contract is invoked, the held first asset object is split, and a second asset object matching the second accounts payable is split from the first asset object and transferred to the second-level provider for holding, so that the second accounts payable with the second-level provider is transferred to the lower-level provider as a data asset, and the transfer of the second accounts payable with the second-level provider is completed to replace the transfer of funds.

After receiving the transaction sent by the core enterprise, the node equipment in the block chain can respond to the transaction, perform consensus processing on the transaction, and match the first accounts payable with the second accounts payable after the consensus is passed; if the matching confirms that the amount of the second accounts payable is not larger than the amount of the first accounts payable, an asset splitting logic declared in the intelligent contract deployed in a blockchain can be called, a first asset object held by the first-level supplier is split, and a second asset object matched with the second accounts payable is split from the first asset object;

certainly, if it is determined through matching that the amount of the second accounts payable is greater than the amount of the first accounts payable, because the debt scale between the first-level provider and the second-level provider is already greater than the debt scale between the core enterprise and the first-level provider, the first asset object held by the first-level provider cannot be split, and a notification message of asset transfer failure may be returned to the first-level asset holder;

for example, in practical applications, the notification message may be a text prompt "the asset pool is in insufficient balance and the asset transfer fails".

In an embodiment shown, before invoking the asset splitting logic declared in the intelligent contract deployed in the blockchain and splitting the first asset object held by the first-level provider, the node device may further search data stored in the blockchain to determine whether the block chain currently stores the second accounts payable after being created by the first-level provider for the second-level provider and being granted by the second-level provider; if yes, the collection right corresponding to the corresponding accounts payable is proved to be transferred to the second-level supplier, and then the first asset object held by the first-level supplier is split.

In an illustrated embodiment, when invoking the asset splitting logic declared in the intelligent contract deployed in the blockchain and splitting the first asset object held by the first-level provider, the node device may specifically obtain the amount of the second accounts payable, convert the amount of the second accounts payable into an asset amount, and split the asset object equal to the asset amount from the first asset object to obtain the second asset object.

After the node device splits a second asset object matched with the second payable from the first asset object by calling the asset splitting logic stated in the intelligent contract, the split second asset object can be transferred to the second-level provider (i.e. a creditor of the second payable) for holding; for example, the address information of the split second asset object may still be added to the account object corresponding to the second-level provider on the blockchain.

It should be noted that, if it is confirmed through matching that the amount of the second accounts payable is identical to the amount of the first accounts payable, the asset amounts of the first asset object and the second asset object are also identical; therefore, the above-described process of splitting the second asset object matching the second payable from the first asset object and transferring the second asset object to the second-level provider is substantially equivalent to the process of transferring the entire first asset object to the second-level provider.

That is, the debt size of the accounts payable between the core enterprise and the first level supplier is identical to the debt size of the accounts payable between the first level supplier and the second level supplier, the first level supplier can transfer the collection right of the first accounts payable to the second level supplier as a whole, and the subsequent first level supplier does not have the collection right of the first accounts payable.

Further, after splitting a second asset object matched with the second account payable from the first asset object, the node device may further generate an asset creation record corresponding to the second asset object, and issue the generated asset creation record to the blockchain for evidence storage;

that is, the process of splitting the second asset object matching the second payable from the first asset object also corresponds to the process of creating a second asset object for the second level supplier by the first level supplier based on the second payable with the second level supplier.

Wherein the asset creation record corresponding to the second asset object includes a correspondence between the second asset object and the second payable.

In addition, after the node device transfers the split second asset object to the second-level asset holder for holding, it may also generate an asset transfer record corresponding to the first asset object, and issue the generated asset transfer record to the blockchain for evidence storage;

namely, the first asset object is split, and the split second asset object is continuously transferred to a lower-level provider, which is equivalent to continuously transferring part of the asset objects in the first asset object to the lower-level provider, so that the asset transfer is completed.

The asset circulation record comprises the corresponding relation among the first asset object, a second asset object split from the first asset object and a second-level supplier holding the second asset object.

Correspondingly, the second-level supplier in the multi-level suppliers may also perform the same actions as the first-level supplier, if a debt relationship based on accounts payable still exists between the second-level supplier and the next-level third-level supplier, the second asset object may be continuously split in the same manner based on a third account payable between the second-level supplier and the third-level supplier, and the split asset object may be continuously transferred to the next-level supplier, and so on, the first asset object may be continuously transferred to the next-level supplier based on the debt relationship between the respective-level suppliers. Finally, the first asset object created based on the first payoff is continuously split and transferred through the splitting process described above, and is distributed and held by suppliers at all levels.

In this specification, for any one of the target suppliers in the multiple stages of suppliers in the supply chain financial system, in addition to charging the corresponding amount of accounts payable funds to the core enterprise based on the amount of the held asset object when the first account payable is due, since the real accounts payable are anchored by the asset objects held by the suppliers at all stages, the suppliers at all stages can transfer the held asset objects and the accounts payable corresponding to the held asset objects to financial institutions such as banks as collateral to initiate financing loan.

In this case, the target supplier may construct a transaction for financing based on the third asset object (which is also the asset object separated from the first asset object) and may distribute the transaction on the blockchain, and may transfer the third asset object held to the financial institution.

After receiving the transaction sent by the target supplier, the node equipment in the block chain can respond to the transaction, perform consensus processing on the transaction, execute the transaction after the consensus is passed, and transfer the third asset object to a financial institution for holding; for example, the address information of the third asset object may be added to the account object corresponding to the financial institution on the blockchain.

Subsequently, when the first payable funds expire, the financial institution may charge the core enterprise a corresponding amount of accounts payable funds based on the amount of the held asset object.

When the financial institution receives the third asset object transferred by the target supplier, the financial institution may further confirm whether the third accounts payable corresponding to the third asset object has been transferred to the financial institution and has obtained the right of the financial institution;

for example, in implementation, in the transaction, an asset ID of the third asset object may be further included, the financial institution may query, based on the asset ID of the third asset object, an asset creation record of the third asset object certified on the block chain to obtain a third payable amount corresponding to the third asset object, and may further confirm whether the target provider has transferred the third payable amount to the financial institution and has authorized the third payable amount.

If the financial institution confirms that the target supplier has transferred the third accounts payable to the financial institution and that the financial institution has also made a confirmation of the third accounts payable, the financial institution may convert the amount of the property of the third asset object into a money amount and issue a loan to the target supplier based on the converted amount of the property.

After the financial institution issues a loan to the target supplier, the financial institution may generate a financing record corresponding to the target supplier, and issue the generated financing record to the blockchain for deposit.

In this specification, the core enterprise may further initiate a liquidation process for the first asset object when a first payment account corresponding to the first asset object is about to expire (for example, one to two days before the expiration).

It should be noted that, in some financial scenarios, the process of performing a liquidation process on asset objects may generally refer to a process of summarizing asset objects split from a first asset object to clarify a distribution status of the asset objects split from the first asset object in the multi-stage suppliers.

In some financial scenarios, the process of clearing the asset objects may also be a process of summarizing the asset objects split from the first asset object, determining each level of supplier holding the asset objects split from the first asset object, and then completing the exchange of accounts payable based on the determined actual amount of the asset objects split from the first asset object held by each level of supplier.

That is, in practical applications, a process of making clear the distribution status of the asset objects split from the first asset object in the multi-level suppliers may be referred to as an inventory processing process for the first asset object; the process of specifying the distribution status of the asset objects split from the first asset object among the plurality of suppliers and completing the exchange of accounts payable for each asset object based on the specified distribution status may be referred to as a process of liquidation processing for the first asset object, and is not particularly limited in this specification.

The core enterprise can construct a transaction for liquidating the asset object based on the first asset object, carry the first asset object in the transaction, and issue the transaction on the blockchain to call the deployed intelligent contract and initiate the asset liquidation processing aiming at the first asset object.

And after receiving the transaction, the node equipment in the block chain can respond to the transaction, perform consensus processing on the transaction, call the asset allocation logic declared in the intelligent contract deployed in the block chain after the consensus passes, search the asset transfer record which is stored in the block chain and is related to the first asset object, and perform asset allocation processing on the first asset object based on the searched asset transfer record.

In an illustrated embodiment, before invoking the asset liquidation logic declared in the intelligent contract deployed in the block chain, the node device may set all the asset objects currently held by the multi-level asset holders to a transition limited state, and after completing liquidation processing for the first asset object, restore the asset objects currently held by the multi-level asset holders to a normal state, in order to avoid inaccurate liquidation results due to the transition of asset objects occurring during liquidation.

Wherein assets set to a transfer-restricted state will be temporarily frozen and unable to be transferred. When the node equipment receives the transaction aiming at the asset object in the transfer limited state, the node equipment does not respond and directly returns an asset transfer failure notification message to a transaction initiator;

for example, the notification message of the asset transfer failure may specifically be a text prompt message "the transfer cannot be performed temporarily during the asset sorting process".

In this specification, the asset transition record related to the first asset object, which is certified in the blockchain, may specifically include the asset transition record of the first asset object, and the asset transition record of the asset object split from the first asset object.

When searching for the asset transition record related to the first asset object, which is verified in the block chain, the asset transition record of the first asset object may be first searched for based on the asset ID of the first asset object, then the asset ID of the second asset object split from the first asset object is read from the asset transition record of the first asset object, and then the asset transition record corresponding to the second asset object is searched for based on the asset ID of the second asset object, and so on.

After all asset transition records related to the first asset object and stored in the blockchain are found, the first asset object may be subjected to asset liquidation processing based on the found asset transition records, and all levels of suppliers holding the asset objects split from the first asset object are determined.

The asset circulation record records the corresponding relationship among the asset object, the asset object split from the asset object and all levels of suppliers holding the split asset object, so that the distribution condition of the asset object split from the first asset object in all levels of suppliers and all levels of suppliers holding the split asset objects can be determined by searching and tracing downwards according to the splitting sequence.

Further, after determining each level of the supplier holding the asset object from the first asset object, when the first payment due corresponding to the first asset object expires, the core enterprise may complete the exchange of the payable account based on the determined actual amount of the asset object separated from the first asset object held by each level of the supplier.

In other words, since the first payment account is actually in the form of an asset object, it is split into several shares, each held by a supplier at each level; the suppliers of all levels obtain the collection right of the accounts payable in the first account payable; therefore, when the core enterprise cashes the first payable account, the core enterprise cashes the first payable account based on the actual share of the first payable account held by each level of provider, and pays the payable account to each level of provider.

Of course, since the asset object transferred to the account object corresponding to the financial institution is also the asset object separated from the first asset object, the core enterprise also needs to complete the exchange of accounts payable based on the actual amount of the asset object held by the financial institution.

In this specification, after the first payable account expires, the node device in the blockchain may further determine whether the core enterprise redeems the payable corresponding to the asset object split from the first asset object; if yes, the asset object split from the first asset object can be subjected to asset verification processing.

In implementation, in an intelligent contract deployed in a blockchain, corresponding asset underwriting logic may also be declared. After the core enterprise cashes the asset objects held by the suppliers at all levels based on the asset liquidation result, corresponding cashed records can be generated and issued to the blockchain for storage.

The suppliers or financial institutions at all levels receiving accounts payable paid by the core enterprise can construct a transaction for verifying and selling the asset object based on the held asset object which is paid by the core enterprise, and issue the transaction to the block chain to call an asset verifying and selling program in the intelligent contract to complete asset verifying and selling processing aiming at the asset object;

the specific mode of the asset verification processing of the asset object is not particularly limited in this specification; for example, in one approach, the asset may be marked as redeemed in an account object corresponding to the blockchain at each level of the supplier or financial institution holding the asset object; alternatively, in another implementation manner, the address information of the asset object may also be directly removed from the account object, which is not listed in this specification.

When the verification and cancellation processing process of all the asset objects split from the first asset object is completed, the clearing and resolving processing process of the core enterprise for the first asset object is ended at this time.

In this specification, for any one of the above multi-stage suppliers, asset tracing processing may be performed on a held target asset object by sending a tracing request to a node device in a block chain.

And when receiving a tracing request for the target asset object, the node devices in the blockchain may query, in response to the tracing request, asset creation records and asset circulation records related to the target asset object, which are certified on the blockchain.

It should be noted that the asset creating record and the asset circulation record related to the target asset object, which are stored in the block chain, may specifically include the asset creating record and the asset circulation record of the target asset object, and the asset creating record and the asset circulation record of the source asset object of the target asset object, which are split.

When the asset creating record and the asset circulation record which are found based on the search are found, tracing the target asset object, and determining a source asset object which is split into the target asset object; and accounts payable corresponding to the source asset object.

The asset circulation records record the corresponding relationship among the asset objects, the asset objects split from the asset objects and all levels of suppliers holding the split asset objects, so that the source asset objects of the target asset objects split can be determined by searching and tracing upwards according to the splitting sequence. Meanwhile, based on the found asset creation record corresponding to the source asset object, the accounts payable corresponding to the source asset object can be specified.

Through the asset tracing process described above, for any one of the above-mentioned multi-level asset holders, the source asset object of the target asset object can be definitely split based on the asset creation record and the asset circulation record certified on the block chain; and accounts payable corresponding to the source asset object, so that the source and circulation process of the held target asset object can be confirmed.

In the technical scheme, the method can realize that the first account payable between the asset publisher and the first-level asset holder is continuously split to the lower-level asset holder in the form of digital assets based on the account payable between the first asset holder and the lower-level asset holder, and then the first account payable is continuously transferred to the lower-level asset holder; therefore, under the condition that the first payable account between the asset issuing party and the first-level asset holder is not yet honored, the second payable account between each level of asset holder and the higher-level asset holder can be taken as the digital asset and continuously transferred to the lower-level asset holder to replace the circulation of the fund, so that the influence on the normal operation of the lower-level asset holder caused by the fact that the payable account between the higher-level asset holder and the asset issuing party is not yet honored can be reduced to the greatest extent.

For example, assuming that the asset issuer is a core enterprise, the first level asset holder of the multi-level asset holders is a first level provider having an obligation relationship with the core enterprise, and the second level asset holder is a second level provider having an obligation relationship with the first level provider, assuming that the core enterprise needs to complete a purchase with the first level provider, the core enterprise may create an asset object on the blockchain based on a first accounts payable with the first level provider, and transfer the created asset object to the first level provider to complete the purchase (i.e., pay the purchase payment in the form of the created digital asset if the purchase payment has not been paid).

Correspondingly, assuming that the first-level provider also needs to complete the purchase of the goods to the second-level provider, the first-level provider may continue to split the digital asset based on the second accounts payable with the second-level provider, and may continue to transfer the split digital asset to the second-level provider to complete the purchase.

Therefore, for all levels of lower-level suppliers, on the premise that the core enterprise does not carry out cashing on the first payment account, the payment account payable between the lower-level suppliers and the upper-level property holder is taken as the digital property and is continuously transferred to the lower-level property holder, normal purchasing is finished instead of fund circulation, and normal operation of the lower-level suppliers is not influenced.

Corresponding to the above method embodiments, the present specification further provides an embodiment of an asset tracing apparatus based on a blockchain. The device can be applied to a distributed exchange built based on a block chain; the distributed exchange includes a number of distributed, deployed trading centers. The embodiment of the asset tracing device based on the block chain in the specification can be applied to the electronic equipment. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. Taking a software implementation as an example, as a logical device, the device is formed by reading, by a processor of the electronic device where the device is located, a corresponding computer program instruction in the nonvolatile memory into the memory for operation. From a hardware aspect, as shown in fig. 2, the hardware structure diagram of the electronic device where the asset tracing apparatus based on the block chain is located in this specification is shown, except for the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 2, the electronic device where the apparatus is located in the embodiment may also include other hardware according to an actual function of the electronic device, which is not described again.

Fig. 3 is a block diagram illustrating an asset tracing apparatus based on a blockchain according to an exemplary embodiment of the present disclosure.

Referring to fig. 3, the asset tracing apparatus 30 based on a block chain can be applied to the electronic device shown in fig. 2, wherein the electronic device is applied to an asset circulation system based on block chain building; the asset circulation system comprises an asset publisher and a multi-level asset holder; a first level asset holder of the multi-level asset holders holding a first asset object created based on a first payback between the asset issuer and the first level asset holder; the first asset object is split based on accounts payable between the first level asset holder and a lower level asset holder and then transferred to the lower level asset holder; the block chain-based asset tracing apparatus 30 includes:

a receiving module 301, configured to receive a tracing request for a target asset object held by any one of the multi-level asset holders;

the searching module 302 is used for responding to the source tracing request and inquiring the asset creating record and the asset circulation record which are stored on the block chain and are related to the target asset object; wherein the asset creation record comprises a correspondence between accounts payable and an asset object; the asset circulation record comprises the corresponding relation among an asset object, an asset object split from the asset object and a lower-level asset holder holding the split asset object;

the source tracing module 303 is configured to perform source tracing on the target asset object based on the found asset creating record and asset transfer record, and determine a source asset object into which the target asset object is split; and accounts payable corresponding to the source asset object.

In this specification, the receiving module 301 further:

the device 30 further comprises:

a splitting module 304 (not shown in fig. 3), in response to the first transaction, matching the first payable with the second payable, and when the amount of the second payable is not greater than the amount of the first payable, invoking asset splitting logic declared in the smart contract issued on the blockchain, splitting the first asset object, splitting a second asset object matching the second payable from the first asset object, and transferring the split second asset object to the second level asset holder for holding.

In the present specification, the apparatus 30 further includes:

a generating module 305 (not shown in fig. 3), after splitting a second asset object matching the second payable payment from the first asset object, generating an asset creation record corresponding to the second asset object, and issuing the generated asset creation record to a blockchain for storage; wherein the asset creation record comprises a correspondence of the second asset object with the second payable payment;

In this specification, the splitting module 304 is further to:

In this specification, the receiving module 301 further:

the device 30 further comprises:

a creation module 306 (not shown in FIG. 3) that, in response to the second transaction, invokes asset creation logic declared in the smart contract issued on the blockchain, creates the first asset object based on the first payoff payment, and transfers the created first asset object to the first level asset holder for holding; and the number of the first and second groups,

In this description, the creation module 306 further:

In this specification, the asset circulation system is a supply chain financial system; the supply chain financial system comprises a core enterprise as an asset publisher, a multi-level supplier as an asset holder, and a financial institution; wherein the property object is used to initiate a financing loan to the financial institution.

In this specification, the receiving module 301 further:

the device 30 further comprises:

and a transfer module 307, configured to transfer the third asset object to the financial institution to hold in response to the third transaction, so that the financial institution converts the asset amount of the third asset object into a fund amount after confirming a third account payable corresponding to the third asset object, and issues a loan to the supplier based on the converted fund amount.

The implementation process of the functions and actions of each module in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.

For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution in the specification. One of ordinary skill in the art can understand and implement it without inventive effort.

The systems, devices, modules or modules illustrated in the above embodiments may be implemented by a computer chip or an entity, or by an article of manufacture with certain functionality. A typical implementation device is a computer, which may take the form of a personal computer, laptop computer, cellular telephone, camera phone, smart phone, personal digital assistant, media player, navigation device, email messaging device, game console, tablet computer, wearable device, or a combination of any of these devices.

Corresponding to the method embodiment, the present specification also provides an embodiment of an electronic device. The electronic equipment can be applied to an asset transfer system built based on a block chain; the asset circulation system comprises an asset publisher and a multi-level asset holder; a first level asset holder of the multi-level asset holders holding a first asset object created based on a first payback between the asset issuer and the first level asset holder; wherein the first asset object is split based on accounts payable between the first level asset holder and a subordinate asset holder and then transferred to the subordinate asset holder; the electronic device includes: a processor and a memory for storing machine executable instructions; wherein the processor and the memory are typically interconnected by an internal bus. In other possible implementations, the device may also include an external interface to enable communication with other devices or components.

In this embodiment, by reading and executing machine executable instructions stored by the memory corresponding to control logic for blockchain-based asset tracing, the processor is caused to:

In this specification, the asset circulation system is a supply chain financial system; the supply chain financial system comprises a core enterprise as an asset publisher, a multi-level supplier as an asset holder, and a financial institution; wherein the asset object is used for initiating financing loan to the financial institution;

by reading and executing machine-executable instructions stored by the memory corresponding to control logic for blockchain-based asset tracing, the processor is caused to:

Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This specification is intended to cover any variations, uses, or adaptations of the specification following, in general, the principles of the specification and including such departures from the present disclosure as come within known or customary practice within the art to which the specification pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the specification being indicated by the following claims.

It will be understood that the present description is not limited to the precise arrangements described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.

The above description is only a preferred embodiment of the present disclosure, and should not be taken as limiting the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims

1. An asset tracing method based on a block chain is applied to an asset transfer system built based on the block chain; the asset circulation system comprises an asset publisher and a multi-level asset holder; a first level asset holder of the multi-level asset holders holding a first asset object created based on a first payback between the asset issuer and the first level asset holder; the first asset object is split level by level based on accounts payable between the first level asset holder and a lower level asset holder and then transferred to the lower level asset holder; the method comprises the following steps:

receiving a source tracing request aiming at a target asset object which is split from the first asset object and held by any one of the multi-stage asset holders; inquiring asset creating records and asset circulation records which are stored on the blockchain and are related to the target asset object in response to the source tracing request; wherein the asset creation record comprises a correspondence between accounts payable and an asset object; the asset circulation record comprises the corresponding relation among an asset object, an asset object split from the asset object and a lower-level asset holder holding the split asset object;

determining a source asset object of the target asset object based on the searched asset creating record and asset circulation record; and accounts payable corresponding to the source asset object.

2. The method of claim 1, the first asset object being transferred to a subordinate asset holder after a progressive split based on accounts payable between the first level asset holder and the subordinate asset holder, comprising:

and splitting a second asset object matched with second accounts payable from the first asset object based on the second accounts payable between the first asset holder and a second level asset holder of the multi-level asset holders, transferring the split second asset object to the second level asset holder for holding, continuing to split a third asset object matched with third accounts payable from the second asset object based on the third accounts payable between the second asset holder and a third level asset holder of the multi-level asset holders, transferring the split third asset object to the third level asset holder for holding, and the like.

3. The method of claim 2, said splitting a second asset object from the first asset object that matches a second payable based on a second payable between the first asset holder and a second level asset holder of the plurality of levels of asset holders, and transferring the split second asset object to the second level asset holder for holding, comprising:

4. The method of claim 3, further comprising:

5. The method of claim 4, further comprising:

6. The method of claim 2, prior to performing a split process on the first asset object, further comprising:

7. The method of claim 1, further comprising:

8. The method of claim 7, further comprising, prior to creating the first asset object based on the first payback:

9. The method of claim 1, the asset circulation system being a supply chain financial system; the supply chain financial system comprises a core enterprise as an asset publisher, a multi-level supplier as an asset holder, and a financial institution; wherein the property object is used to initiate a financing loan to the financial institution.

10. The method of claim 9, further comprising:

11. An asset tracing device based on a block chain is applied to an asset transfer system built based on the block chain; the asset circulation system comprises an asset publisher and a multi-level asset holder; a first level asset holder of the multi-level asset holders holding a first asset object created based on a first payback between the asset issuer and the first level asset holder; the first asset object is split based on accounts payable between the first level asset holder and a lower level asset holder and then transferred to the lower level asset holder, and the asset transfer system is a supply chain financial system; the supply chain financial system comprises a core enterprise as an asset publisher, a multi-level supplier as an asset holder, and a financial institution; the device comprises:

12. The apparatus of claim 11, the asset circulation system being a supply chain financial system; the supply chain financial system comprises a core enterprise as an asset publisher, a multi-level supplier as an asset holder, and a financial institution; wherein the property object is used to initiate a financing loan to the financial institution.

13. An electronic device is applied to an asset transfer system built based on a block chain; the asset circulation system comprises an asset publisher and a multi-level asset holder; a first level asset holder of the multi-level asset holders holding a first asset object created based on a first payback between the asset issuer and the first level asset holder; the first asset object is split level by level based on accounts payable between the first level asset holder and a lower level asset holder and then transferred to the lower level asset holder; the method comprises the following steps:

a processor;

a memory for storing machine executable instructions;

receiving a source tracing request aiming at a target asset object which is split from the first asset object and held by any one of the multi-stage asset holders;