WO2020242338A1

WO2020242338A1 - Method for verifying the result of a game when gambling online

Info

Publication number: WO2020242338A1
Application number: PCT/RU2019/000389
Authority: WO
Inventors: Константин Геннадьевич ЛОМАШУК; Александр Сергеевич ДАВЫДОВ; Илья Александрович ШИРОБОКОВ; Алиса Евгеньевна ЧЕРНЯЕВА
Original assignee: Общество С Ограниченной Ответственностью "Блокпруф Тех"
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-12-03

Abstract

The claimed invention relates to a method for verifying the result of a game by a user when gambling online in a system comprising an online casino with gaming machines, a certifier, a verifying party and a proving party. The method comprises steps in which the user is presented with a gaming machine and a results table relating to a single game. Furthermore, for verifying the result of the game, three keys are generated, a digital signature of the certifier is produced in said keys and a computing key is transmitted to the proving party to provide evidence that, in the game, the results table relating exclusively to this game was used. Therefore, users can continuously monitor the results without a Table of all the results being disclosed, thereby increasing the protection of each player against fraud in a game.

Description

METHOD FOR VERIFICATION OF RESULTS AND GRAINS WHEN CARRYING OUT

ONLINE GAMING

Technology area

The present invention relates to computerized wagering gaming systems, more specifically to a method for verifying a game result when conducting online gambling using zero knowledge proofs.

The method can be used to prove the presence of a dropped combination of a plurality of combinations of a gaming machine in an initially established set of combinations without disclosing the initial set of combinations to users.

Prior art

Gambling has been the favorite game of people for thousands of years and has recently become more widespread and popular. As with other forms of entertainment, players enjoy playing a wide variety of new types of games. Throughout this disclosure, the terms "game" and "gaming devices" are used to indicate that some form of wagering is associated with it.

There are tons of ways to have fun on the Internet. Online slot machines are very popular due to their convenient access for users.

There is a known method for protecting data in a computerized wagering game device (see, for example, R IJ 2302276 C2), including the following steps:

verifying the game data during the operation of the computerized game device by a procedure including storing game data containing the game code. in the first memory;

using a bullet proof sequence to verify game data, wherein the zero knowledge proof sequence interrogates the stored game data to authenticate the stored game data:

loading the game code into the second memory;

hashing the saved game data with a random number;

FIXED SHEET (RULE 91) comparing the zero-knowledge response with stored game data related to the zero-knowledge proof responses in a continuously executing program stream executing on the computerized game controller; and

verifying that the zero-knowledge proof sequence is correctly completed while the computerized gaming device is operating.

However, this known method does not allow to provide the possibility of proving the presence of a combination dropped out in a round of the game in the Table of Results of the gaming machine without disclosing the Table of Results, i.e. does not allow for the possibility of continuous monitoring by an interested party, for example, a player, or a casino, or an auditor, without disclosing the Table of Results to the interested party.

The scorecard determines the probability of winning. Since the player does not have access to the Scoreboard, and the Scorecard used is not checked against the original Scoreboard each time, the casino operator is able to use different Scoreboards within the same game. This leads to changes in the economic model and the actual deception of the player.

In mathematical systems, interactive verification is informally viewed as a protocol implemented between two parties, in which one party, called the prover, tries to prove some fact to the other party, called the verifier (verifier). Interactive verification usually takes the form of a challenge-response protocol, in which the prover and verifier exchange messages, and the verifier issues either "accepted" or "rejected" as a result of the protocol execution. In addition to its theoretical interest, interactive checks have found some applications in cryptography and computer security, such as identification and authentication. In these situations, the fact requiring proof is usually, but not always, related to verifying the identity of the prover, such as the prover's secret key. An interactive zero-knowledge proof protocol was used to create the present invention. An interactive zero knowledge proof protocol allows one of the interacting parties ("The verifier" - the verifying party) to verify the reliability of any statement (usually mathematical), without having any other information from the other party ("The proven") ... Moreover, the last condition is necessary, since it is usually trivial to prove that a party has certain information in most cases if it has the right to simply disclose information. The whole difficulty lies in proving that one of the parties has information without disclosing its content. The protocol should take into account that the prover will only be able to convince the verifier if the statement is indeed true. Otherwise, it will be impossible to do this, or extremely unlikely due to the computational complexity. The interactivity of the protocol means the direct exchange of information between the parties.

Thus, the considered protocol requires the presence of interactive initial data from the verifier, as a rule, in the form of a task or a problem. The goal of the legal prover (having proof) in this protocol is to convince the verifier that he has a solution, without giving away even part of the "secret" proof ("zero knowledge"). The purpose of the verifier is to make sure that the prover is not "lying."

Zero knowledge proof protocols were also developed that did not require interactive input data, and the proof of which, as a rule, relies on the assumption of an ideal cryptographic hash function, that is, it is assumed that the output of a one-way hash function cannot be predicted if its entrance is not known. Also, zero-knowledge proofs can be used in confidential computation protocols, which allow multiple participants to ensure that the other party is following the protocol honestly. To protect the player from cheating, there is a certification and / or licensing mechanism, during which the results and behavior of the game are audited and the result of the audit is legally assigned to this game. But in fact, it is impossible to determine unambiguously that this particular certified code is currently running. In the current certification and / or licensing model, detection of fraud requires ongoing monitoring and verification by the certifying and / or licensing authority. The proposed system allows for the possibility of continuous monitoring by users without disclosing the results table to these users.

Statement of the essence of the invention

The basis of the present invention is the task of creating a method for verifying the result of a game when conducting online gambling, which will ensure the exclusion of falsification by an online casino or a player when conducting gambling.

The proposed method makes it possible to provide the possibility of proving the presence of a combination dropped out in a round of the game in the Table of Results of the gaming machine without disclosing the Table of Results, i.e. allows for the possibility of continuous monitoring by an interested party, for example, a player, or a casino, or an auditor, without disclosing the Table of Results to the interested party.

The problem was solved by creating a method for verifying the result of the game by the user when conducting online gambling in a system containing an online casino with slot machines, a certifier, a verifying party and a proving party, containing the steps at which

provide the player with a slot machine that the player has access to via the Internet,

represent the game in the gaming machine as a sequence of rounds, at the beginning of each of which the player makes a bet,

provide a Scorecard owned by the casino from the casino to a certifier that implements a zero-knowledge proof function, with the Scorecard referring to one game, containing many rounds, and contains all the possible combinations that can occur in the game, and the winning coefficient related to each of these combinations,

at the same time, by means of the certifier, they implement the function of proving the correspondence of the player's combination to the Table of Results without disclosing the Table of Results,

three keys are generated by the generating module on the basis of the provided Results Table, including a computational key, a verification key and a game digital fingerprint key, all three keys being generated once for all rounds of one game and refer only to said Table of Results,

form a digital signature of the certifier in the specified keys, to confirm that it was the specified generation module that generated the computational key that verifies the key and the key of the digital fingerprint of the game, the player's combination is obtained, dropped out in one round of the game, the computational key is transmitted to the prover to verify the proof that the casino uses the Table of Results related to this game, for which they generate a proof in the proof module, which is stored and executed on the casino server, that the player's drawn combination is present in the Table of Results, and the proof is carried out for each round,

transfer the verification key to the verifying party interested in checking the correspondence of the dropped combination to the Table of Results, and

transmit to the verifying party the proof from the proof module that the player's dropped combination is present in the Table of Results,

transferred to the verification module, which is provided by the certifier and is publicly available so that the user can see the verification result, verifying the key from the verifying party, the generated proof from the proving party and the key of the digital fingerprint of the game from the generation module, showing that the player is playing this particular game and will receive the result is in this game, while the verification module verifies the generated proof of belonging to the combinations of the player to the Table of results, based on the obtained proof, the verification key and the key of the digital fingerprint of the game, and form the verification result,

and if the verification result is positive, the verifying party is informed that the dropped combination belongs to the Table of Results, refers to the gaming machine on which the game is being played, and there was no tampering, and if the verification result is negative, the verifying party is informed that the dropped combination does not belong to the Table of Results or does not apply to the gaming machine on which the game is being played, which indicates that falsification has occurred.

Preferably, the casino acts as the proving party in the method.

Preferably, in the method, one or more participants selected from the group consisting of a player, an auditor or a casino act as a relying party.

Preferably, the method uses a computer program as a gaming machine, which is located on an online casino server in the form of a program code, the program code including an audiovisual design of a game, a game logic, and a pseudo-random number generator.

Preferably, the method uses a computational key that is a private key and belongs only to the prover.

Preferably, the method uses a set of data as a computational key used to generate a proof presented by the prover for the verifying party that the drawn bit string combination of the player corresponds to the Table of Results.

Preferably, the method uses a verification key, which is a public key that is available to any party interested in verification.

Preferably, the method uses a set of data as a verification key, which is used to generate evidence provided by the prover for the verifying party that the drawn combination of the player corresponds to the Table of Results. Preferably, the method uses the key of the digital fingerprint of the game, which is a public key and can be part of the verification key.

Preferably, the method uses a set of data that characterizes and relates to one game as the key of the digital fingerprint of the game.

Brief Description of Drawings

The invention will be further explained by the description of a preferred embodiment with reference to the accompanying drawing, in which FIG. 1 is a schematic flowchart of a method for verifying a game result by a user when conducting online gambling.

Description of the preferred embodiment of the invention

A method for verifying a game result by a user when conducting online gambling in a system containing an online casino with slot machines, a certifier, a verifying party and a proving party is carried out as follows.

The player is provided with a gaming machine 1 (Fig. 1), to which the player has access via the Internet, and the game is presented in the gaming machine 1. The game of chance is represented as a sequence of rounds, at the beginning of each of which the player makes a bet, and at the end of each round the player's balance changes.

To place a bet, the player either transfers money or tokens to his account or account in the online casino and places a bet from it in a particular game, or the player places a bet directly from his personal electronic wallet and the casino blocks these funds until the game ends. If the player wins in the round, the casino transfers the blocked or transferred funds to the player with his winnings, or transfers the funds to himself if the player loses.

A Scorecard belonging to the casino 1 is provided from the casino to the certifier 2, which implements a zero-knowledge proof function. The scoring table refers to one game containing many rounds and contains all possible combinations that can occur in the game and the winning odds associated with each of these combinations. For example, the combination "1" corresponds to the winning coefficient 0, this means that if the player has the combination "1", then his bet will be multiplied by zero and the corresponding result of the round will be, or, for example, the combination 2 corresponds to the winning coefficient 8, this means that if the player has a combination of "2", then his bet will be multiplied by 8 and the corresponding result of this round will be, etc.

A slot machine can potentially have multiple games, each with its own Scoreboard. In any case, a Scoreboard exists for every casino game, whether they use our solution or not. The table of results, as it is presented in this application, is compiled by the casino specifically for this solution.

By means of the certifier 2, the function of proving the correspondence of the player's combination to the Table of Results is implemented without disclosing the Table of Results.

To carry out verification, three keys are first generated by the generating unit 3 on the basis of the provided Table of Results, including the computing key 4, the verification key 5 and the key 6 of the digital fingerprint of the game, and all three keys 4, 5, 6 are generated once for all rounds one game for all combinations of one gaming machine and refer only to the mentioned Results Table. A pseudo-random number generator is used as the generating unit 3, i.e. it is a software or hardware module that generates a sequence of random bit strings of a given length, the elements of which obey a given distribution. In this case, the pseudo-random number generator will only be part of module 3.

A slot machine is a software or hardware module that transforms a fixed-length input bit string received from a pseudo-random number generator.

A digital signature of the certifier 2 is formed in the specified keys 4,5,6 to confirm that it was the specified generation module 3 that generated the computing key 4, which verifies the key 5 and the key 6 of the digital fingerprint of the game. Computing key 4 is a private key and belongs only to the prover.

Verification key 5 is a public key available to any party interested in verification.

Key 6 of the digital fingerprint of the game from the generation module is public, it is publicly available, but in fact the "program" itself transmits it, since it shows that he belongs to the game, that the player plays this particular game and will receive the result in this particular game.

All these keys 4, 5, 6 contain information i.e. a digital signature that it was module 3 that generated these keys. Generation module 3 is managed by certifier 2, this is, in fact, the party that installs all these modules into the game, but these modules work autonomously and without constant control by the certifier.

After receiving the player's combination, dropped out in one round of the game, perform the following steps. A player's combination can be just a number, or it can be a more complex structure, and it is expressed as a bit string within the online casino code.

Before the player starts to play, the computing key 4 with a digital signature is transmitted to the prover 7 to form a proof that the casino 1 uses the Table of Results related to the given game. For this, a proof is generated in the proof module 8, which is stored and executed on the server 9 of the casino 1, that the drawn combination of the player is present in the Table of Results, and the proof is carried out for each round.

At the stage of starting the game by the player, before the combination falls out, the checking key 5 is transferred to the checking party 10 interested in checking the correspondence of the dropped combination to the Results Table. The transfer implies that the verification key 5 is stored, it can be stored anywhere, and it does not really matter.

And the proof is transmitted to the verifying party 10 from the proof module 8 that the player's dropped combination is present in the Table of results. That is, the proof that the Table of Results refers to a given game is the presence of the dropped combination in this Table of Results. The prover 7, using the proof module 8, generates a proof of using the correct Table of Results of the slot machine.

They are delivered to the verification module 1 1, which is provided by the certifier 2 and is publicly available so that the user can see the verification result, verifying the key 5 from the verifying party 10, the generated proof for each round of the game from the proving party 8 and the key 7 of the digital fingerprint of the game from the generation module 3 , showing that the player is playing this particular game and will get the result in this particular game. At the same time, in the verification module 1 1, the generated proof of the belonging of the dropped combination of the player to the Table of Results is verified, based on the obtained proof, the verification key and the key of the digital fingerprint of the game, and the verification result is generated.

And if the result of verification is positive, the verifying party 10 is informed that the dropped combination belongs to the Table of Results, refers to the gaming machine on which the game is being played, and there was no falsification.

And if the result of verification is negative, the verifying party 10 is informed that the drawn combination does not belong to the Table of Results or does not belong to the gaming machine on which the game is being played, which indicates that falsification has occurred.

The casino acts as the proving side 7.

The verifying party 10 is one or more participants selected from a group consisting of an auditor or casino player.

As a gaming machine 1, a computer program is used, which is located on the server 9 of an online casino in the form of a program code, and the program code includes an audiovisual design of a game, a game logic, a pseudo-random number generator.

As a computational key 4, a set of data is used that is used to form the evidence of the presented proving I 1 side 7 for the checking side 5 that the dropped out combination of the player's bit lines corresponds to the Table of results.

As the key 6 of the digital fingerprint of the game, a set of data is used that characterizes and relates to one game. The key 6 of the digital fingerprint of the game, which is a public key, can be an integral part of the verification key 5.

The party that has the computational key 4 is the prover 7 provides evidence to the verifier.

The party that has the verifying key 5 is the verifying party 10 and verifies the evidence received from the proving party 7. The verifying party 10 is usually the player.

The party generating the computational key 4, verifying the key 5 and the key 6 of the digital fingerprint of the game based on the provided Scoreboard, is the party that is trusted by all other parties.

Claims

CLAIM

1 . A method for verifying the result of a game by a user when conducting online gambling in a system containing an online casino with slot machines, a certifier, a verifying party and a proving party, containing the steps at which

provide a Scorecard belonging to the casino from the casino to a certifier that implements a zero knowledge proof function, the Scorecard referring to one game containing many rounds and containing all possible combinations that can occur in the game and the win rate related to each of these combinations,

form a digital signature of the certifier in the specified keys, to confirm that it was the specified generation module that generated the computational key that verifies the key and the key of the digital fingerprint of the game, the player's combination is obtained, dropped out in one round of the game, the computational key is transmitted to the prover to form a proof that the casino uses the Table of Results related to this game, for which they generate a proof in the proof module, which is stored and executed on the casino server, which the player's dropped combination is present in the Results Table, and the proof is carried out for each round,

transfer the checking key to the checking party interested in checking the correspondence of the dropped combination to the Table of Results, and

transferred to the verification module, which is provided by the certifier and is publicly available so that the user can see the verification result, verifying the key from the verifying party, the generated proof from the proving party and the key of the digital fingerprint of the game from the generation module, showing that the player is playing this particular game and will receive the result is in this game, while the verification module verifies the generated proof that the player's dropped combination belongs to the Table of Results, based on the obtained proof, the verification key and the key of the digital fingerprint of the game, and form the verification result,

2. The method according to claim 1, wherein the casino acts as the proving party.

3. The method according to claim 1, wherein one or more participants selected from a group consisting of a player, an auditor or a casino act as the checking party.

4. The method according to claim 1, in which a computer program is used as a gaming machine, which is located on the server of an online casino in the form of a program code, and the program code includes an audiovisual design of a game, a game logic, a pseudo-random number generator.

5. The method according to claim 1, wherein a computational key is used, which is a private key and belongs only to the prover.

6. The method according to claim 1 or 5, in which a set of data is used as a computational key, which is used to generate a proof presented by the prover for the verifying party that the drawn combination of the player's bit strings corresponds to the Table of Results.

7. The method according to claim 1, in which a verification key is used, which is a public key, available to any party interested in verification.

8. The method according to claim 1 or 7, in which the data set used to generate the proof provided by the prover for the verifying party is used as the verification key that the drawn combination of the player corresponds to the Table of Results.

9. The method according to claim 1, wherein the key of the digital fingerprint of the game is used, which is a public key and can be an integral part of the verification key.

10. A method according to claim 1 or 9, wherein a set of data characterizing and relating to one game is used as the key of the digital fingerprint of the game.