WO2022121011A1

WO2022121011A1 - Cross-system transfer method and apparatus for blockchain assets

Info

Publication number: WO2022121011A1
Application number: PCT/CN2020/140133
Authority: WO
Inventors: 刘伟伟; 王洋; 须成忠; 叶可江
Original assignee: 中国科学院深圳先进技术研究院
Priority date: 2020-12-09
Filing date: 2020-12-28
Publication date: 2022-06-16
Also published as: CN112465640A

Abstract

A cross-system transfer method and apparatus for blockchain assets. The method and apparatus comprise: an asset seller searching for potential buyers on a target blockchain system, making all the potential buyers provide value evaluations, and performing transaction information collection (S101); the asset seller returning all collected transaction information to all the potential buyers, and respectively arranging, on a source blockchain system and a target blockchain system, a smart contract for asset exchange (S102); and a buyer and a seller concluding a transaction by means of the smart contract before a final transaction time, so as to complete asset transfer and transaction between the two parties (S103). By means of the method and apparatus, point-to-point decentralized cross-chain transfer and exchange of assets are realized between blockchain systems. A first stage is asset exchange, i.e. a potential buyer searching stage, and a second stage is a transfer protocol, i.e. a value transfer stage. Assets of a user can be exchanged between blockchain systems on the premise of not breaking the closure of the blockchain systems themselves.

Description

Method and device for cross-system transfer of blockchain assets

technical field

The present invention relates to the field of blockchain, in particular, to a method and device for cross-system transfer of blockchain assets.

Background technique

Blockchain technology is currently a hot frontier technology research solution. The value attribute is an important feature of the blockchain at the beginning of its birth. The main function of the first-generation blockchain technology represented by Bitcoin is to realize decentralized distributed accounting, so that point-to-point transactions can be realized between two unfamiliar individuals without a trusted third party.

With the development and progress of blockchain technology, more and more blockchain systems have been designed and run online. Most of these systems support bookkeeping and transfer functions, and can take advantage of the immutability and decentralization of blockchain technology to enhance the security of transfer and bookkeeping. However, due to the closed nature of the system itself, these values are enclosed within the blockchain system and cannot be transferred between blockchain systems. The purpose of this closed and stable design scheme is to ensure the independence and stability of the blockchain system, avoid external influences on the blockchain system, and objectively strengthen the security of the blockchain system. However, with the diversification and complexity of blockchain systems, this closedness is not conducive to the communication between blockchain systems and hinders the further development of blockchain technology. How to realize the transfer of value between blockchain systems without breaking the closedness of the blockchain system itself is the top priority to improve the efficiency of the blockchain system.

At present, there are two main solutions for blockchain value transfer:

One is to use a trusted third party to solve the trust problem of information communication and value exchange. Currently common intermediate exchanges, such as Ripple, Binance, Bitmain, etc., can be classified into this type of technical solutions. Such technical solutions entrust transactions through a third party trusted by all parties, match transactions through trusted intermediaries, and ensure security and risk control during the transaction process. When the user adopts this technical solution to realize asset exchange, the user first sends information such as his own asset certificate and the information that he wants to convert into an asset form to a trusted third party, and the third-party intermediary agency will inform both parties of the transaction after receiving the relevant information Match to find buyer needs that suit sellers. When the matching is successful, the intermediary guarantees the transaction between the two parties and charges a certain fee as an incentive. The value ratio used in the transaction process is a real-time exchange rate summary reached by the intermediary agency's collection of market transaction information.

The second is to use the side chain or relay chain to transmit transaction information, and ensure information security through a cryptographic mechanism. This transaction method uses a unified technical interface to solve the problem of trusted information exchange in different blockchain systems, and uses cryptographic methods to ensure the one-way, irreversible, tamper-proof and uniqueness of the information communication process. In this technical solution, developers need to develop a side chain or relay chain in advance for information transfer. Developers and operation and maintenance personnel first put the side chain and the relay chain online and bind it to the original main chain, and ensure that the multi-agents of the two blockchain systems can use the side chain and the relay chain to carry out communication. letter communication. When users use this method to transfer assets across chains, they first need to use additional mechanisms to find the buyer and the value ratio, and guide the completion of the transaction with the ratio agreement reached by the two parties using the additional mechanism. When the two parties have reached a transaction intention and completed the discussion on the transaction details, the seller sends the transaction details to the side chain or to the target system through the relay chain, and the buyer receives the transaction information and confirms and verifies the completion. Confirm in the target blockchain system and use the target blockchain system to complete the transaction process.

However, the above two technical solutions have their shortcomings, and there are still some problems that are not solved by the above two solutions.

In the scheme of using a trusted third party for information communication and exchange, users need to rely on a third party to complete transaction processes such as information exchange, transaction matching, and market information aggregation, which sacrifices the block to a large extent. The decentralized nature of the chain system weakens the decentralized nature of the native blockchain system, and is not a perfect solution. Compared with other systems, the biggest advantage of the blockchain system is decentralization, anonymity, and security. In order to realize the cross-chain transfer of value, this solution recreates a centralized information intermediary outside the blockchain system to carry out The aggregation of information and the connection of transactions make the completion of the transaction strongly depend on the reliability of the third-party intermediary, and transfer the user's information and the control of the transaction to the intermediary. When all the blockchain systems participating in the value exchange are stable and the currency value is stable, this mechanism can operate stably. Once the blockchain system is affected by the outside world and produces violent fluctuations in value, or the third-party intermediary structure is maliciously attacked, there will be problems with the operation of this intermediary mechanism, which will affect the efficiency of value transfer.

The second type of cross-chain value mechanism that uses the side chain or relay chain to transmit transaction information actually only solves the security and reliability issues of asset cross-chain transfer, and does not provide complete technical support for the value transfer process. When users use this method to transfer value, they need to agree on transaction details and transaction process through additional mechanisms or institutions, which increases the user's workload and increases the information barriers in the transaction process, so that users need to rely on Additional work to complete the preparation of the transaction. From the perspective of the entire transaction process, the mechanism of using the side chain or relay chain to transmit transaction information is not a complete transaction process, but only guarantees the security of this process of value exchange. The confirmation work lacks a corresponding implementation.

technical problem

Embodiments of the present invention provide a method and device for cross-system transfer of blockchain assets, so as to at least solve the technical problem that the existing blockchain asset cross-system transfer protocol cannot perform effective value exchange.

technical solutions

According to an embodiment of the present invention, a method for cross-system transfer of blockchain assets is provided, including the following steps:

S101: The asset seller looks for potential buyers on the target blockchain system, and asks all potential buyers to give value assessments and collect transaction information;

S102: The asset seller returns all the collected transaction information to all potential buyers, and arranges smart contracts for asset exchange on the source blockchain system and the target blockchain system respectively;

S103: The buyer and the seller reach a transaction through the smart contract before the final transaction time to complete the asset transfer and transaction of both parties.

Further, the method specifically includes the following steps:

S101: The asset seller finds potential buyers on the target blockchain system through broadcast information, and asks all potential buyers to give value assessments and collect transaction information;

S102: The asset seller returns all the collected transaction information to all potential buyers, and uses Atomic-Swap atomic swap technology to arrange asset exchange smart contracts on the source blockchain system and the target blockchain system respectively;

Further, step S101 includes:

S1011: The asset seller sends the asset information to be transferred to the target blockchain system and broadcasts it, and informs potential buyers of the deadline for final bidding;

S1012: The potential buyer sends the bid for the target asset to the asset seller;

S1013: The asset seller collects all bidding information before the deadline.

Further, step S102 includes:

S1021: The asset seller sends all the collected information to all potential buyers, and marks the winner and the winning price;

S1022: The asset seller generates a pair of public and private keys, sends the public key to the winning buyer, uses the private key to generate a smart contract for selling the asset, and publishes it on the selling blockchain system;

S1023: The winning buyer uses the public key to generate a smart contract for transferring assets, and publishes it on the blockchain system after the transfer;

S1024: The asset seller uses the private key to obtain the assets on the transferred blockchain system;

S1025: The winning buyer uses the private key obtained in step S1024 to obtain the sold asset.

Further, before step S101, the method further includes the step of preset condition:

The value exchange ratio between the value carriers of different blockchain systems is formed spontaneously in the market exchange;

All subjects participating in the value exchange can give appropriate valuations for the exchanged assets according to their own value judgments, and the rational highest valuations given by all subjects will approach the true value of the market value ratio;

When participating in the value exchange process to obtain benefits, the subjects in the blockchain system will actively participate in the value exchange process;

The operation of the protocol depends on the value contained in the asset being sold.

Further, use the Vickery auction mechanism to evaluate the value of assets.

Further, the collected information is used to generate smart contracts for asset transfer using the Vickery auction mechanism.

According to another embodiment of the present invention, a cross-system transfer device for blockchain assets is provided, including:

Potential buyer search unit, used by asset sellers to find potential buyers on the target blockchain system, and let all potential buyers give value assessments and collect transaction information;

The smart contract arrangement unit is used for the asset seller to return all the collected transaction information to all potential buyers, and arrange the smart contracts for asset exchange on the source blockchain system and the target blockchain system respectively;

The asset transfer and transaction unit is used for buyers and sellers to reach a transaction through smart contracts before the final transaction time to complete the asset transfer and transaction of both parties.

A storage medium storing program files capable of implementing any of the above methods for transferring blockchain assets across systems.

A processor is used for running a program, wherein when the program is running, any one of the above-mentioned methods for transferring blockchain assets across systems is executed.

beneficial effect

The method and device for cross-system transfer of blockchain assets in the embodiments of the present invention are used to realize point-to-point, decentralized asset cross-chain transfer and exchange of assets between blockchain systems. It mainly consists of two stages, the first stage is asset exchange, that is, the potential buyer search stage and the second stage is the transfer agreement, that is, the value transfer stage. Under the premise of not destroying the closedness of the blockchain system itself, users' assets can be exchanged between blockchain systems. Through this technical solution, users can transfer their own value between different blockchain systems, and can exchange the value form between different systems at a ratio that conforms to the market value relationship. By optimizing the design ideas, users can directly reach a point-to-point value transfer transaction with the transaction party without the need to disclose their own information and only need to give the transaction address without resorting to a trusted third party.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Fig. 1 is the flow chart of the block chain asset cross-system transfer method of the present invention;

Fig. 2 is the preferred flow chart of the cross-system transfer method of blockchain assets of the present invention;

Fig. 3 is the preferred flow chart of the block chain asset cross-system transfer method of the present invention;

Figure 4 is a pseudo-code description diagram of the operation of the asset seller in the first stage;

Figure 5 is a pseudo-code description diagram of potential buyers bidding in the first stage;

Figure 6 is a pseudo-code description diagram of the asset seller's asset selling behavior in the second stage;

Figure 7 is a pseudo-code description diagram of the asset acquired by the buyer;

Figure 8 is the interactive logic diagram of buyers and sellers in the first stage, where Alice is the asset seller, others are potential buyers, system A is the source system, and system B is the target system;

Figure 9 is the interactive logic diagram of buyers and sellers in the second stage, where Alice is the asset seller, others are potential buyers, system A is the source system, and system B is the target system;

Figure 10 is a system architecture diagram of the source system and the target system;

FIG. 11 is a block diagram of the cross-system transfer device for blockchain assets according to the present invention.

Embodiments of the present invention

In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

Example 1

According to an embodiment of the present invention, a method for cross-system transfer of blockchain assets is provided. Referring to FIG. 1, the method includes the following steps:

The blockchain asset cross-system transfer method in the embodiment of the present invention is used to realize point-to-point, decentralized asset cross-chain transfer and exchange of assets between blockchain systems. It mainly consists of two stages, the first stage is asset exchange, that is, the potential buyer search stage and the second stage is the transfer agreement, that is, the value transfer stage. Under the premise of not destroying the closedness of the blockchain system itself, users' assets can be exchanged between blockchain systems. Through this technical solution, users can transfer their own value between different blockchain systems, and can exchange the value form between different systems at a ratio that conforms to the market value relationship. By optimizing the design ideas, users can directly reach a point-to-point value transfer transaction with the transaction party without the need to disclose their own information and only need to give the transaction address without resorting to a trusted third party.

Wherein, the method specifically includes the following steps:

Wherein, referring to FIG. 2, step S101 includes:

S1013: The asset seller collects all bidding information before the deadline.

Wherein, referring to FIG. 3, step S102 includes:

Wherein, before step S101, the method further includes a preset condition step:

Among them, the Vickery auction mechanism is used to evaluate the value of assets.

Among them, the collected information is used to generate smart contracts for asset transfer using the Vickery auction mechanism.

Hereinafter, the method for cross-system transfer of blockchain assets of the present invention will be described in detail with specific embodiments:

In the blockchain system with tokens as the value carrier, due to the closed nature of the blockchain system, these values are enclosed within the blockchain system, and value cannot be transferred between blockchain systems. This results in ineffective value exchange between blockchain systems, and users are strongly bound within the system and cannot operate between blockchain systems. This design scheme can objectively maintain the stability of the blockchain system itself, allowing users in the system to actively maintain the blockchain system, but it also objectively causes difficulties in collaboration between blockchain systems, which is not conducive to the The long-term development of blockchain technology.

In view of the above problems, the present invention aims to design a method for cross-system transfer of blockchain assets based on the Vickery auction mechanism and the Atomic-Swap atomic swap technology. Assets are exchanged between blockchain systems. Through this technical solution, users can transfer their own value between different blockchain systems, and can exchange the value form between different systems at a ratio that conforms to the market value relationship. By optimizing the design ideas, users can directly reach a point-to-point value transfer transaction with the transaction party without the need to disclose their own information and only need to give the transaction address without resorting to a trusted third party.

Referring specifically to FIGS. 4 to 10 , the present invention provides a method for cross-system transfer of blockchain assets, which is used to realize point-to-point, decentralized asset cross-chain transfer and exchange of assets between blockchain systems. It mainly consists of two stages, the first stage is asset exchange, that is, the potential buyer search stage and the second stage is the transfer agreement, that is, the value transfer stage.

In the first stage, the asset seller finds potential buyers on the target blockchain system by broadcasting information, and asks all potential buyers to give a value evaluation; in the second stage, the asset seller will All the collected transaction information is returned to all potential buyers, and the Atomic-Swap atomic swap technology is used to arrange smart contracts for asset exchange on the source blockchain system and the target blockchain system respectively. The buyer and the seller reach a transaction before the final transaction time through the smart contract to complete the asset transfer and transaction of both parties.

The core content of the present invention is the design method of the above-mentioned two-stage value exchange agreement and the design mode of the asset transfer smart contract based on the design of the two-stage agreement. The preset conditions of the present invention include:

1. The value exchange ratio between the value carriers of different blockchain systems is formed spontaneously in the market exchange, and the value judgments of the main players in the market between different value carriers jointly promote the formation of the value exchange ratio in the market;

2. All subjects participating in the value exchange can give appropriate valuations for the exchanged assets according to their own value judgments, and the rational highest valuations given by all subjects will approach the true value of the market value ratio;

3. When participating in the value exchange process to obtain certain benefits, the subjects in the blockchain system will actively participate in the value exchange process;

4. The operation of the protocol depends on the value contained in the asset being sold. Once the market has a negative attitude towards the value of the asset being sold itself, the asset being sold cannot find a suitable buyer for value transfer.

The main process of the potential buyer search stage (ie the first stage) is as follows:

1. The asset seller sends the asset information to be transferred to the target blockchain system and broadcasts it, and informs potential buyers of the deadline for final bidding;

2. Potential buyers send bids for the target asset to the asset seller;

3. The asset seller collects all bidding information before the deadline;

The main process of the value transfer stage (ie the second stage) is as follows:

1. The asset seller sends all the information collected in the first stage to all potential buyers, and marks the winner and the winning price;

2. The asset seller generates a pair of public and private keys, sends the public key to the winning buyer, uses the private key to generate a smart contract for selling assets, and publishes it on the selling blockchain system;

3. The winning buyer uses the public key to generate a smart contract for transferring assets, and publishes it on the blockchain system after the transfer;

4. The asset seller uses the private key to obtain the assets on the transferred blockchain system;

5. The winning buyer uses the private key obtained in step 4 to obtain the sold asset.

Example 2

According to another embodiment of the present invention, a cross-system transfer device for blockchain assets is provided, see FIG. 11 , including:

Potential buyer finding unit 201, used by the asset seller to find potential buyers on the target blockchain system, and let all potential buyers give value evaluation and collect transaction information;

The smart contract arrangement unit 202 is used for the asset seller to return all the collected transaction information to all potential buyers, and arrange smart contracts for asset exchange on the source blockchain system and the target blockchain system respectively;

The asset transfer and transaction unit 203 is used for the buyer and the seller to reach a transaction through the smart contract before the final transaction time to complete the asset transfer and transaction of both parties.

The block chain asset cross-system transfer device in the embodiment of the present invention is used to realize point-to-point, decentralized asset cross-chain transfer and exchange of assets between block chain systems. It mainly consists of two stages, the first stage is asset exchange, that is, the potential buyer search stage and the second stage is the transfer agreement, that is, the value transfer stage. Under the premise of not destroying the closedness of the blockchain system itself, users' assets can be exchanged between blockchain systems. Through this technical solution, users can transfer their own value between different blockchain systems, and can exchange the value form between different systems at a ratio that conforms to the market value relationship. By optimizing the design ideas, users can directly reach a point-to-point value transfer transaction with the transaction party without the need to disclose their own information and only need to give the transaction address without resorting to a trusted third party.

Hereinafter, the block chain asset cross-system transfer device of the present invention will be described in detail with specific embodiments:

In view of the above problems, the present invention aims to design a blockchain asset cross-system transfer device based on the Vickery auction mechanism and the Atomic-Swap atomic swap technology, which enables users to Assets are exchanged between blockchain systems. Through this technical solution, users can transfer their own value between different blockchain systems, and can exchange the value form between different systems at a ratio that conforms to the market value relationship. By optimizing the design ideas, users can directly reach a point-to-point value transfer transaction with the transaction party without the need to disclose their own information and only need to give the transaction address without resorting to a trusted third party.

4-10, the present invention provides a block chain asset cross-system transfer device for realizing point-to-point, decentralized asset cross-chain transfer and exchange of assets between block chain systems. It mainly consists of two stages, the first stage is asset exchange, that is, the potential buyer search stage and the second stage is the transfer agreement, that is, the value transfer stage.

In the first stage, the potential buyer finding unit 201 is used by the asset seller to find potential buyers on the target blockchain system through broadcast information, and let all potential buyers give value evaluations; in the second stage, The smart contract arrangement unit 202 is used for the asset seller to return all the transaction information collected in the first stage to all potential buyers, using Atomic-Swap atomic swap technology on the source blockchain system and the target blockchain system respectively. Smart contracts that lay out asset exchanges. The asset transfer and transaction unit 203 is used for the buyer and the seller to reach a transaction through the smart contract before the final transaction time to complete the asset transfer and transaction of both parties.

In the potential buyer search unit 201, the main process of the potential buyer search stage (ie the first stage) is as follows:

2. Potential buyers send bids for the target asset to the asset seller;

3. The asset seller collects all bidding information before the deadline;

In the smart contract arrangement unit 202 and the asset transfer and transaction unit 203, the main process of the value transfer stage (ie the second stage) is as follows:

Example 3

Example 4

The key points of the present invention and the points to be protected include:

1. Use the Vickery auction mechanism to conduct market valuation of assets;

2. A smart contract generation method for asset transfer using the information collected by the Vickery auction mechanism;

3. Smart contract implementation model in the process of asset transfer.

The main advantages of the present invention are:

1. Decentralization. The information exchange and asset transfer between asset sellers and buyers are directly formed point-to-point without any third-party organization, which ensures the decentralization of the blockchain system itself.

2. Reasonable value ratio. In the process of asset value cross-chain transfer, the value ratio is naturally formed in the auction process, which is a market behavior and does not rely on any third-party information. After derivation, it can be verified that with the increase of buyers, the final value ratio converges to the true market value ratio.

3. Security. The invention utilizes cryptographic methods such as RSA encryption and Atomic-Swap atomic exchange protocol to ensure the security and confidentiality of the exchange process.

4. Privacy protection. In the process of asset exchange, the user only needs to give the asset address and asset certificate, and does not need to give specific identity information to complete the asset exchange, thus protecting the privacy and security of the user.

The present invention is proved feasible through experimental verification. In the laboratory environment, two Ethereum test chains were built during verification, and the corresponding blockchain asset value cross-chain transfer smart contracts were deployed in the two Ethereum test chains respectively. Through experiments, the present invention verifies the feasibility of this protocol. Aiming at the situation that there may be multiple players competing in the process of asset cross-chain transfer, experiments show that the final value exchange ratio is close to the real market exchange ratio, and it quickly converges and tends to be stable as the number of participating buyers increases.

Alternatives to the present invention include:

1. Replace other encryption algorithms to realize the key pair in the process of asset exchange;

2. Replace other auction mechanisms to search for potential buyers;

3. Realize the exchange of value through other means other than the Atomic-Swap asset exchange scheme.

The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages or disadvantages of the embodiments.

In the above-mentioned embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The system embodiments described above are only illustrative, for example, the division of units may be a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or integrated into Another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of units or modules, and may be in electrical or other forms.

Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , which includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes: U disk, Read-Only Memory (ROM, Read-Only Memory) Memory), random access memory (RAM, Random Various media that can store program codes, such as Access Memory), mobile hard disks, magnetic disks or CD-ROMs.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims

A method for cross-system transfer of blockchain assets, characterized in that it includes the following steps:

S101: The asset seller looks for potential buyers on the target blockchain system, and asks all potential buyers to give value assessments and collect transaction information;

S102: The asset seller returns all the collected transaction information to all potential buyers, and arranges smart contracts for asset exchange on the source blockchain system and the target blockchain system respectively;

S103: The buyer and the seller reach a transaction through the smart contract before the final transaction time to complete the asset transfer and transaction of both parties.
The method for cross-system transfer of blockchain assets according to claim 1, wherein the method specifically comprises the following steps:

S101: The asset seller finds potential buyers on the target blockchain system through broadcast information, and asks all potential buyers to give value assessments and collect transaction information;

S102: The asset seller returns all the collected transaction information to all potential buyers, and uses Atomic-Swap atomic swap technology to arrange asset exchange smart contracts on the source blockchain system and the target blockchain system respectively;

S103: The buyer and the seller reach a transaction through the smart contract before the final transaction time to complete the asset transfer and transaction of both parties.
The method for cross-system transfer of blockchain assets according to claim 1, wherein step S101 comprises:

S1011: The asset seller sends the asset information to be transferred to the target blockchain system and broadcasts it, and informs potential buyers of the deadline for final bidding;

S1012: The potential buyer sends the bid for the target asset to the asset seller;

S1013: The asset seller collects all bidding information before the deadline.
The method for cross-system transfer of blockchain assets according to claim 1, wherein step S102 comprises:

S1021: The asset seller sends all the collected information to all potential buyers, and marks the winner and the winning price;

S1022: The asset seller generates a pair of public and private keys, sends the public key to the winning buyer, uses the private key to generate a smart contract for selling the asset, and publishes it on the selling blockchain system;

S1023: The winning buyer uses the public key to generate a smart contract for transferring assets, and publishes it on the blockchain system after the transfer;

S1024: The asset seller uses the private key to obtain the assets on the transferred blockchain system;

S1025: The winning buyer uses the private key obtained in step S1024 to obtain the sold asset.
The method for cross-system transfer of blockchain assets according to claim 1, characterized in that, before step S101, the method further comprises the step of preset conditions:

The value exchange ratio between the value carriers of different blockchain systems is formed spontaneously in the market exchange;

All subjects participating in the value exchange can give appropriate valuations for the exchanged assets according to their own value judgments, and the rational highest valuations given by all subjects will approach the true value of the market value ratio;

When participating in the value exchange process to obtain benefits, the subjects in the blockchain system will actively participate in the value exchange process;

The operation of the protocol depends on the value contained in the asset being sold.
The method for cross-system transfer of blockchain assets according to claim 1, wherein a Vickery auction mechanism is used to evaluate the value of the assets.
The method for cross-system transfer of blockchain assets according to claim 1, wherein the collected information is used to generate a smart contract for asset transfer by using a Vickery auction mechanism.
A cross-system transfer device for blockchain assets, characterized in that it includes:

Potential buyer search unit, used by asset sellers to find potential buyers on the target blockchain system, and let all potential buyers give value assessments and collect transaction information;

The smart contract arrangement unit is used for the asset seller to return all the collected transaction information to all potential buyers, and arrange the smart contracts for asset exchange on the source blockchain system and the target blockchain system respectively;

The asset transfer and transaction unit is used for buyers and sellers to reach a transaction through smart contracts before the final transaction time to complete the asset transfer and transaction of both parties.
A storage medium, characterized in that, the storage medium stores a program file capable of implementing the method for cross-system transfer of blockchain assets according to any one of claims 1 to 7.
A processor, characterized in that the processor is used to run a program, wherein when the program runs, the method for transferring blockchain assets across systems according to any one of claims 1 to 7 is executed.