KR102346835B1 - Method for measuring p2p network usage, recording medium, device and system for performing the method - Google Patents

Abstract

The present invention relates to a method for measuring P2P network usage comprising the following steps: allowing an uploader to acquire a proof of provenance from a manager; starting a P2P communication session through a handshake between a downloader and the uploader when the downloader's file transfer order is completed; transmitting, by the uploader, a file of an ordered file transfer unit (piece) to the downloader when receiving an ordered file transfer unit (piece) from the downloader; transmitting, by the uploader, a file transfer receipt to the manager when receiving a file transfer receipt (proof of piece) and a piece received ACK from the downloader; and receiving a file transfer fee from the manager on the basis of the file transfer receipt when the download of the file is completed. Accordingly, the method can provide a highly reliable content charging policy among users of a P2P file transfer network.

Description

Method for measuring p2p network usage, recording medium, device and system for doing it

The present invention relates to a method for measuring p2p network usage, a recording medium, an apparatus and a system for performing the same, and more particularly, a p2p file transfer network capable of maintaining high reliability between users in a content delivery network (CDN) environment. It relates to technology for measuring usage.

A system and method for measuring usage are needed for billing according to network usage during p2p file transfer. However, unlike the server-client model, since file transfer is performed between users, there is a problem in that file transfer is difficult without trust between users.

For example, if user A has transmitted 1gb to user B, and therefore charges a transmission fee and usage fee equivalent to 1gb, user B complains that there is no file transmitted from user A and that user C receives 1gb (a so-called collusion attack ( Collusion attack) may occur.

Therefore, there is a need for a reliable measurement method and a method for billing the p2p network usage between users.

KR 10-2063309 B1 US 9,735,972 B2

Kim, K.; You, Y.; Park, M.; Lee, K. DDoS Mitigation: Decentralized CDN Using Private Blockchain. 2018 Tenth International Conference on Ubiquitous and Future Networks (ICUFN). IEEE, 2018, pp. 693-696.

Accordingly, it is an object of the present invention to provide a method for measuring p2p network usage.

Another object of the present invention is to provide a recording medium in which a computer program for performing the method for measuring the p2p network usage is recorded.

Another object of the present invention is to provide an apparatus for performing the method for measuring the p2p network usage.

Still another object of the present invention is to provide a system for performing the method for measuring the p2p network usage.

A method for measuring p2p network usage according to an embodiment for realizing the above object of the present invention includes: an uploader obtaining proof of provenance from a manager; when the downloader's file transfer order is completed, starting a p2p communication session through a handshake between the downloader and the uploader; transmitting, by the uploader, the file of the ordered file transfer unit (piece) to the downloader when receiving the ordered file transfer unit (piece) from the downloader; transmitting, by the uploader, the file transfer receipt to the manager when receiving a file transfer receipt and a piece received ACK from the downloader; and receiving a file transfer fee from the manager based on the file transfer receipt when the download of the file is completed.

In an embodiment of the present invention, the method for measuring the p2p network usage may further include, when the download of the file is normally completed, receiving an authority for the downloader to become an uploader by the administrator. have.

In an embodiment of the present invention, it is possible to check whether the download of the file is normally completed through the challenge and response of the downloader who has downloaded the file by the administrator.

In an embodiment of the present invention, the step of the uploader delivering the file transfer receipt to the manager may deliver the latest proof of piece periodically or before program termination.

In an embodiment of the present invention, the step of receiving the file transfer fee payment from the manager may include receiving the total file transfer fee for a certain period of time.

In an embodiment of the present invention, the file transfer receipt (proof of piece) may include a Content delivery contract ID, Total # of new pieces, Total # of duplicate pieces, Proof of provenance, Downloader's signature and Uploader's signature.

In an embodiment of the present invention, the proof of provenance may include a Content delivery contract ID, a Provenance flag, an Uploader's address, and a Manager's signature.

In the computer-readable storage medium according to an embodiment for realizing the other object of the present invention, a computer program for performing the method for measuring the p2p network usage is recorded.

An apparatus for measuring p2p network usage according to an embodiment for realizing another object of the present invention includes: a right acquiring unit for acquiring proof of provenance from a manager; a session unit for starting a p2p communication session through a handshake between the downloader and the uploader when the downloader's file transfer order is completed; a file transmission unit for transmitting the ordered file transmission unit (piece) of the file to the downloader when receiving the ordered file transmission unit (piece) from the downloader; a receipt transfer unit for transmitting the file transfer receipt to the manager when receiving a file transfer receipt and a piece received ACK from the downloader; and a settlement unit receiving a file transfer fee from the manager based on the file transfer receipt when the file download is completed.

The system for measuring the p2p network usage according to an embodiment for realizing another object of the present invention, places a file download order, and uploads the uploader through verification of proof of provenance Downloader to check permissions; an uploader for transmitting a file of a file transfer unit ordered by the downloader to the downloader, and receiving a file transfer receipt (proof of piece) from the downloader; an administrator who settles the file transfer fee based on the file transfer receipt received from the uploader and grants the right to become an uploader to a downloader who has successfully downloaded a file; and a database for storing a file download order by the administrator, information for p2p file transfer, peer information, the file transfer receipt, and the proof of origin.

According to the method for measuring such p2p network usage, security against a collusion attack that lowers trust between users is excellent. In addition, by increasing the reliability with users, it is possible to induce more active participation in the p2p file transfer network and bring about the effect of increasing the average file transfer speed.

1 is a conceptual diagram of a system for measuring p2p network usage according to an embodiment of the present invention.
2 is a block diagram of an apparatus for measuring p2p network usage according to an embodiment of the present invention.
3 is a conceptual diagram illustrating an example of the manager structure of FIG. 1 .
FIG. 4 is a conceptual diagram for explaining roles of users and the order of usage measurement in the system of FIG. 1 .
5 is a diagram to show the difference between the file transfer of the prior art and the present invention.
6 is a flowchart of a method for measuring p2p network usage according to an embodiment of the present invention.
7 is a timing diagram illustrating an example of file transfer according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] Reference is made to the accompanying drawings, which show by way of illustration specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein with respect to one embodiment may be implemented in other embodiments without departing from the spirit and scope of the invention. In addition, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description set forth below is not intended to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all scope equivalents as those claimed. Like reference numerals in the drawings refer to the same or similar functions throughout the various aspects.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a block diagram of an apparatus for measuring p2p network usage according to an embodiment of the present invention. 2 is a block diagram of an apparatus for measuring p2p network usage according to an embodiment of the present invention. 3 is a conceptual diagram illustrating an example of the manager structure of FIG. 1 .

An apparatus 10 (hereinafter referred to as an apparatus) for measuring p2p network usage according to the present invention relates to a reliable measurement method and a technology capable of billing p2p network usage among users in a content delivery network (CDN) environment.

Referring to FIG. 1 , a system 1 according to the present invention is based on p2p file transmission to a CDN (content delivery network) environment, and includes a manager (10, Manager), an uploader (30, Uploader), a downloader (50, Downloader) and creators (70, Creator). A plurality of the uploader 30 , the downloader 50 , and the creator 70 may exist.

The downloader 50 is a user who wants to download a file, and the uploader 30 is a user who has the file desired by the downloader 50 and wants to receive a file transfer fee by transmitting the file.

The administrator 10 acts as a payment server and is a trusted third party not affiliated with uploaders and downloaders. The manager 10 stores swarm information for p2p file transfer and manages a peerlist (a Tracker function is provided).

The manager 10 manages a database (hereinafter referred to as DB), and since information in the DB is public, anyone can read, but only the manager 10 can write. All information stored in the DB includes a digital signature (for example, the signature of the information creator and the signature of the administrator).

The creator 70 is the original owner of the file, and the creator 70 must first upload a file to be shared to the manager 10 . The uploaded file is registered in the DB, and the downloader 50 can download it through a file download order.

The manager 10 may be in the form of a server or an engine, and the uploader 30, the downloader 50, and the creator 70 are each a device, an apparatus, It may be in the form of a terminal, user equipment (UE), mobile station (MS), wireless device, or handheld device.

The uploader 30 , the downloader 50 , and the creator 70 may have mobility or may be fixed. In addition, the uploader 30 , the downloader 50 , and the creator 70 may execute or produce various software based on an operating system (OS), that is, the system.

The operating system is a system program for software to use the hardware of the device, and is a mobile computer operating system such as Android OS, iOS, Windows Mobile OS, Bada OS, Symbian OS, Blackberry OS and Windows series, Linux series, Unix series, It can include all computer operating systems such as MAC, AIX, and HP-UX.

The manager 10, the uploader 30, the downloader 50, and the creator 70 are each a server or device, but hereinafter, the uploader 30 is defined as a device for measuring p2p network usage. and the present invention will be described with a focus on its role.

Referring to FIG. 2 , the device 30 according to the present invention includes a rights acquiring unit 310 , a session unit 330 , a file transmission unit 350 , a receipt transmission unit 370 , and a settlement unit 390 . .

In the device 10 of the present invention, software (application) for measuring p2p network usage may be installed and executed, and the right acquisition unit 310, the session unit 330, the file transfer unit 350, The configuration of the receipt delivery unit 370 and the settlement unit 390 may be controlled by software for measuring the p2p network usage executed in the device 10 .

The device 10 may be a separate terminal or may be a part of a module of the terminal. In addition, the configuration of the right acquisition unit 310 , the session unit 330 , the file transmission unit 350 , the receipt transmission unit 370 and the settlement unit 390 is formed as an integrated module, or one or more It can be made of modules. However, on the contrary, each configuration may be formed of a separate module.

The right acquiring unit 310 acquires a proof of provenance from the manager 10 . The proof of provenance may include a Content delivery contract ID, a Provenance flag, an Uploader's address, and a Manager's signature. Table 1 below is the structure and description of proof of provenance.

Proof of provenance structure Explanation Content delivery contract ID File download order ID given by Manager. Provenance flag If ‘1’ is valid provenance, ‘0’ is invalid provenance. Invalid provenance is granted when there is a problem with the proof of provenace among the proofs of piece received by the Manager, or when the Downloader stops downloading and wants a refund. Uploader’s address The hash (uploader's public key) used for the digital signature. Manager’s signature Manager's signature.

When the file transfer order of the downloader 50 is completed, the session unit 330 starts a p2p communication session through a handshake between the downloader 50 and the uploader 30 .

When the file transmission unit 350 receives the ordered file transmission unit from the downloader 50 , the file transmission unit 350 transmits the ordered file transmission unit file to the downloader 50 .

When the receipt transfer unit 370 receives a file transfer receipt (proof of piece) and a piece received ACK from the downloader, it transmits the file transfer receipt to the manager. The proof of piece may deliver an up-to-date proof of piece periodically or prior to program termination.

The file transfer receipt (proof of piece) may include a Content delivery contract ID, Total # of new pieces, Total # of duplicate pieces, Proof of provenance, Downloader's signature and Uploader's signature. Table 2 below is the structure and description of the file transfer receipt (proof of piece).

Proof of piece structure Explanation Content delivery contract ID File download order ID given by Manager. Total # of new pieces Number of pieces sent by the Uploader that are not in your possession. Total # of duplicate pieces The number of pieces received by another uploader among the pieces sent by the uploader. “Total # of duplicate pieces” must not exceed “Total # of new pieces”. Initially, the downloader issues a non-overlapping piece request to each uploader. Proof of provenance See Table 1 Downloader's signature Downloader's electronic signature. Downloader signs proof of piece first. Uploader's signature Downloader's digitally signed proof of piece is digitally signed by Uploader.

The settlement unit 390 receives a file transfer fee from the manager based on the file transfer receipt when the download of the file is completed. In an embodiment, the file transfer fee may be calculated as a total file transfer fee for a certain period.

The manager 10 can check whether the download of the file is normally completed through the downloader 50 and the challenge and response that have downloaded the file. In addition, when the download of the file is normally completed, the manager 10 may grant authority to the downloader 50 to become an uploader of the file.

Referring to FIG. 3 , as the structure of the manager 10 , the DB 110 , the content storage 130 for managing a list of contents, the authentication unit 150 for authenticating the authority of the uploader, and digital rights management (Digital Rights) Management) may include a DRM unit 170, a P2P unit 190 that manages swarm information and peer information, and the like.

The DB 110 is managed by the manager 10, and stores a list of downloadable content, network swarm information, a state of a content transfer contract, and a file transfer receipt (proof of piece) for each content transfer contract.

FIG. 4 is a conceptual diagram for explaining roles of users and the order of usage measurement in the system of FIG. 1 .

Referring to FIG. 4 , the creator 70 registers content with the manager 10 . The downloader 2 (52) who wants to receive the file retrieves the content transfer contract and swarm information. Before the p2p file transfer, the downloader 2 (52) checks the upload authority of the uploader 1 (31) by using the DB in which the Proof of provenance is stored.

The downloader 2 (52) requests a p2p handshake from the uploader 1 (31). The uploader 1 ( 31 ) receives a content transmission contract from the manager ( 10 ), and starts content transmission through p2p communication between the uploader 1 ( 31 ) and the downloader 2 ( 52 ).

When the content transmission is completed, the downloader 2 (52) issues a file transfer receipt (proof of piece), which is a receipt for the transmission sent by the uploader 1 (31), and delivers it to the uploader 1 (31).

The uploader 1 (31) periodically delivers a file transfer proof of piece to the manager (10) (and before terminating the program). In addition, the downloader 2 52 confirms that the download has been completed to the manager 10 and checks the proof of provenance stored in the DB.

The manager 10 stores a proof of provenance in a DB and pays a file transmission fee to the uploader 1 31 and the creator 70 after the file download is completed.

Downloaders can only download from uploads that have proof of provenance, and after the download is complete, the administrator checks whether the file has been downloaded normally through challenge and response. If it is confirmed normally, the administrator saves the proof of provenance in the DB and grants the downloader the right to become the uploader.

5 is a diagram to show the difference between the file transfer of the prior art and the present invention.

FIG. 5( a ) shows a conventional file transfer structure, and only an administrator has a file, so that only an administrator can transfer a file.

However, referring to FIG. 5(b), according to the present invention, downloaders 4, 5, 6, and 7 who have downloaded the file can pass the administrator's challenge and response and receive a file transfer receipt (proof of piece) (in DB Enrollment). Downloaders 4, 5, 6 and 7 with proof of provenance can send files to other downloaders as the uploader.

Accordingly, it is possible to bring about an effect of increasing the file transfer speed on average. In addition, since the present invention has excellent security against a collusion attack that lowers trust between users, it is possible to induce more active participation in a p2p file transfer network by increasing trust with users.

6 is a flowchart of a method for measuring p2p network usage according to an embodiment of the present invention. 7 is a timing diagram showing an example of file transfer according to the present invention.

The method for measuring the p2p network usage according to the present embodiment may proceed in substantially the same configuration as the system 1 of FIG. 1 and the device 10 of FIG. 2 . Accordingly, the same components as the system 1 of FIG. 1 and the apparatus 10 of FIG. 2 are given the same reference numerals, and repeated descriptions are omitted.

Also, the method for measuring the p2p network usage according to the present embodiment may be executed by software (application) for measuring the p2p network usage.

A method for measuring p2p network usage according to the present invention relates to a reliable measurement method and a technology capable of billing p2p network usage among users in a content delivery network (CDN) environment.

In a p2p file transfer network in a content delivery network (CDN) environment, as shown in FIG. 1 , there are users in the form of servers or devices serving as the manager 10 , the uploader 30 , the downloader 50 , and the creator 70 . Hereinafter, the uploader 30 is defined as a device for measuring the p2p network usage, and the present invention will be described with a focus on its role.

Referring to FIG. 6 , in the method for measuring the p2p network usage according to the present embodiment, an uploader obtains proof of provenance from a manager (step S10 ).

The proof of provenance may include a Content delivery contract ID, a Provenance flag, an Uploader's address, and a Manager's signature.

When the downloader's file transfer order is completed, a p2p communication session is started through a handshake between the downloader and the uploader (step S20).

Upon receiving the ordered file transfer unit (piece) from the downloader, the uploader transmits the file of the ordered file transfer unit (piece) to the downloader (step S30).

Upon receiving a file transfer receipt (proof of piece) and a piece received ACK from the downloader, the uploader transmits the file transfer receipt to the manager (step S40).

The file transfer receipt (proof of piece) may include a Content delivery contract ID, Total # of new pieces, Total # of duplicate pieces, Proof of provenance, Downloader's signature and Uploader's signature.

The file transfer receipt allows the uploader to deliver an up-to-date proof of piece to the administrator on a regular basis or prior to program termination.

When the download of the file is completed, the file transfer fee is calculated from the manager based on the file transfer receipt (step S50). In an embodiment, the step of receiving the file transfer fee payment from the manager may include receiving the total file transfer fee for a certain period of time.

When the download of the file is normally completed, the downloader may be given permission to become an uploader by the administrator. Whether the download of the file has been completed normally can be checked through the challenge and response of the downloader who downloaded the file by the administrator.

Referring to FIG. 7 , as an example of file transmission according to the present invention, a file is transmitted in pieces.

The downloader 51 who wants to receive the file transfer transmits the download order to the authentication unit 150 of the manager 10 and pays the file transfer fee in advance. The manager 10 receiving the file transfer fee stores the file download order in the DB. The downloader 51 reads the swarm information and the peer information stored in the manager 10 DB, and starts downloading.

Upon file download, the downloader 51 starts a p2p communication session through a handshake with the uploaders 31 and 33. The uploaders 31 and 33 check the file download order stored in the DB, and the downloader 51 checks the proof of provenance of the uploaders 31 and 33 .

The downloader 51 requests the desired piece (file transfer unit) from each uploader 31, 33 (S11, S21), and when the uploader 31, 33 sends the piece (S22, S25, S12), The downloader 51 transmits a proof of piece (file transfer receipt) and piece received ACK (confirmation information that a certain piece has been received) to each uploader 31 and 33 (S23, S26, S13). And, if you do not send a proof of piece (file transfer receipt), no additional piece will be sent.

When the downloader 51 receives the piece sent by the uploaders 31 and 33, it issues a proof of piece (file transfer receipt) as a receipt for the transmission, and delivers it to the uploaders 31 and 33. And the uploaders 31 and 33 sign the proof of piece and periodically deliver only the latest proof of piece (file transfer receipt) to the manager 10 (even before the program is terminated) (S24, S27, S14). Referring to Table 2, the proof of piece (file transfer receipt) is an incremental proof, so you can receive the entire file transfer fee with the most recent version.

The manager 10 pays the file transfer fee paid in advance by the downloader 51 based on the receipt (proof of piece) sent by the uploaders 31 and 33 . The proof of piece (file transfer receipt) is stored in the DB disclosed by the manager 10. A portion of the file transfer fee may also be paid to the manager 10 and the creator 70 . The downloader 51 can check how the prepaid file transfer fee was consumed through the DB

The downloader 51 can download only from the uploaders 31 and 33 who have proof of provenance, and after the download is complete, the manager 10 can check whether the file has been downloaded normally through the challenge and response. have.

When it is confirmed that the file is normally downloaded, the manager 10 may store the proof of provenance in the DB and grant the downloader 51 permission to become the uploader.

The present invention is a bidirectionally signed receipt system using Proof of piece and ACK receive. Therefore, unlike the existing technology, it is possible to receive a proof of piece only when transmitting a piece.

You can increase trust between users by using a non-overlapping piece request during initial file transfer (reduce duplicated pieces). In other words, it is possible to increase trust between users by providing payment for duplicate pieces and transmission receipts.

In addition, the present invention added a system for controlling the role of Uploader using Proof of provenance. Therefore, only the uploader with proof of provenance can upload the file and get paid.

After downloading the file completely, the manager saves the proof of provenance in the DB through challenge and response. For reference, proof of provenance is granted in units of contracts and is valid only for the applicable contents.

If a proof of piece containing incorrect proof of provenance is sent to the manager, the corresponding amount is paid to the manager instead, and the downloader is not given the proof of provenance.

Accordingly, the method for measuring the p2p network usage according to the present invention has excellent security against a collusion attack that lowers trust between users. In addition, by increasing the reliability with users, it is possible to induce more active participation in the p2p file transfer network and bring about the effect of increasing the average file transfer speed.

Such a method for measuring the p2p network usage may be implemented as an application or implemented in the form of program instructions that may be executed through various computer components and recorded in a computer-readable recording medium. The computer-readable recording medium may include program instructions, data files, data structures, etc. alone or in combination.

The program instructions recorded in the computer-readable recording medium are specially designed and configured for the present invention, and may be known and available to those skilled in the computer software field.

Examples of the computer-readable recording medium include hard disks, magnetic media such as floppy disks and magnetic tapes, optical recording media such as CD-ROMs and DVDs, and magneto-optical media such as floppy disks. media), and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.

Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules for carrying out the processing according to the present invention, and vice versa.

Although the above has been described with reference to the embodiments, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below you will understand

Since the present invention is an essential technology for constructing a p2p-based content delivery network (CDN), it can be usefully utilized in the file transfer market.

1: A system for measuring p2p network usage
10: Manager
30, 31, 33: Uploader
50, 52: Downloader
70: Creator
310: Rights Acquisition Department
330: session unit
350: file transfer unit
370: receipt delivery unit
390: settlement department

Claims (10)

step of the uploader (Uploader) obtaining a proof of provenance (proof of provenance) from the manager (Manager);
when the downloader's file transfer order is completed, starting a p2p communication session through a handshake between the downloader and the uploader;
transmitting, by the uploader, the file of the ordered file transfer unit (piece) to the downloader when receiving the ordered file transfer unit (piece) from the downloader;
transmitting, by the uploader, the file transfer receipt to the manager when receiving a file transfer receipt and a piece received ACK from the downloader; and
Comprising; receiving a file transfer fee from the manager based on the file transfer receipt when the download of the file is completed;
The step of starting a p2p communication session through a handshake between the downloader and the uploader includes:
When the downloader prepays the file transfer fee for the desired file to the manager to order the file download, the manager checks the prepaid file transfer fee and stores the file download order in a database, and the uploader stores the file download order in the database. accepting the p2p communication session requested by the downloader by confirming the file download order, and initiating a p2p communication session with the downloader.
According to claim 1,
When the download of the file is normally completed, the method for measuring the p2p network usage, further comprising a;
3. The method of claim 2,
A method for measuring p2p network usage by checking whether the download of the file has been completed normally through the downloader's challenge and response who downloaded the file by the administrator.
The method of claim 1, wherein the step of transmitting the file transfer receipt to the manager by the uploader comprises:
A method for measuring peer-to-peer network usage, delivering an up-to-date proof of piece on a regular basis or prior to program termination.
The method of claim 1, wherein the step of receiving the file transfer fee from the manager comprises:
A method for measuring p2p network usage, in which the entire file transfer fee is paid over a period of time.
According to claim 1,
The file transfer receipt (proof of piece), including Content delivery contract ID, Total # of new pieces, Total # of duplicate pieces, Proof of provenance, Downloader's signature and Uploader's signature, a method for measuring p2p network usage.
3. The method of claim 2,
The proof of provenance is a method for measuring p2p network usage, including Content delivery contract ID, Provenance flag, Uploader's address and Manager's signature.
A computer-readable storage medium in which a computer program for performing the method for measuring the p2p network usage according to any one of claims 1 to 7 is recorded.
a right acquiring unit to obtain proof of provenance from a manager;
a session unit for starting a p2p communication session through a handshake between the downloader and the uploader when the downloader's file transfer order is completed;
a file transmission unit which, upon receiving an ordered file transmission unit (piece) from the downloader, transmits the file of the ordered file transmission unit (piece) to the downloader;
a receipt transfer unit for transmitting the file transfer receipt to the manager when receiving a file transfer receipt and a piece received ACK from the downloader; and
and a settlement unit receiving a file transfer fee from the manager based on the file transfer receipt when the download of the file is completed;
The session unit,
When the downloader prepays the file transfer fee for the desired file to the manager to order the file download, the manager checks the prepaid file transfer fee and stores the file download order in a database, and the uploader stores the file download order in the database. accepting the p2p communication session requested by the downloader by confirming the file download order, and initiating a p2p communication session with the downloader.
a downloader that places an order for file download and verifies the uploader's upload rights through proof of provenance;
an uploader transmitting a file of a file transfer unit ordered by the downloader to the downloader and receiving a file transfer receipt (proof of piece) from the downloader;
an administrator who settles a file transfer fee based on the file transfer receipt received from the uploader and grants a right to become an uploader to a downloader who has successfully downloaded a file; and
A database for storing a file download order by the administrator, information for p2p file transfer, peer information, the file transfer receipt, and the proof of origin;
When the downloader prepays the file transfer fee for the desired file to the manager to order the file download, the manager checks the prepaid file transfer fee and stores the file download order in a database, and the uploader stores the file download order in the database. accepting the p2p communication session requested by the downloader by confirming the file download order, and initiating a p2p communication session with the downloader.

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