A method for transaction of digital asset is provided, including receiving digital asset transaction request information from a user terminal, verifying, by a blockchain network, the transaction request information, and when the verifying the transaction request information is completed, generating, by the blockchain network, information associated with the digital asset, in which the information associated with the digital asset includes a reputation of the digital asset.

An example operation may include one or more of initializing a smart contract (SC) and appending it to a blockchain, registering each of a plurality of participants as a party to the SC, receiving from at least some of the participants an encrypted confidential input commitment, appending the encrypted input commitments to the blockchain, decrypting the encrypted input commitments, executing by the SC at least one business rule using the decrypted input commitments to obtain a business rule result, and identifying a prevailing participant based at least in part on the business rule result.

The present disclosure relates to a method for approving the use of a card by using a token-ID, wherein, in a state where a card token ID, identification information of a user, a push token ID, and a public key of the user are registered in a blockchain database and a blockchain transaction ID corresponding thereto is managed, when payment request information is acquired, a relay server: requests authentication of order data from a user terminal; checks whether a user signature value obtained in response to the authentication request is valid, and registers the order data in the blockchain database; and registers, in the blockchain database, approval result information which is obtained through verification of the order data by a financial server, and transmits the approval result information to at least one of a service providing terminal and the user terminal.

A method for maintaining state and event information for all of a user's devices associated in a common location using a blockchain where each block includes an event block and a device block within it, where each event and device block refers to an earlier block of the respective type, resulting in a blockchain-in-a-blockchain architecture. The device and event blocks store data regarding each device associated with a user and events related to the devices/user, respectively. Any time a new event occurs, or a device is registered or removed, a new set of blocks is created, where submissions regarding device changes or events can be made by any participant due to the decentralized and public nature of a blockchain. The result is a system where all data regarding a user's registered devices and events is kept in a common location in a manner that is auditable and verifiable.

A multi-function transaction card may include a card body having dimensions that are in accordance with a standard for transaction cards, an output device on the card body, and a secure element within the card body. The multi-function transaction card may pair, via a wireless connection, the multi-function transaction card with a terminal. The multi-function transaction card may receive, from the terminal, information associated with a transaction. The multi-function transaction card may generate, based on the information associated with the transaction, and using a cryptographic key, an authorization request cryptogram (ARQC), wherein the cryptographic key is stored in the secure element. The multi-function transaction card may generate, based on the ARQC, a machine-readable code. The multi-function transaction card may display, using the output device, the machine-readable code.

Some implementations of the disclosure are directed to receiving, at an authentication server system, a distributed ledger address transmitted by a client device to identify itself during an authentication process for accessing a network, where the distributed ledger address corresponds to a distributed ledger network; transmitting an authentication challenge message from the authentication server to the client device; in response to transmitting the authentication challenge message from the authentication server to the client device, receiving at the authentication server, a response to the challenge message including a signature; and using at least the distributed ledger network to determine if the signature used to sign the response to the challenge message is associated with the distributed ledger address transmitted by the client device.

A method and a device for managing access authorization to a payment service provided to a user is disclosed. A request to initialize at least one access authorization is received from a terminal of the owner user. Such an access authorization is intended to allow at least one delegated user to access the account of the owner user, the request comprising at least one identifier of the delegated user and one identifier of the owner user. Temporary data for accessing an account associated with the delegated user is generated, the temporary data comprising a public identifier associated with the delegated user, and a confidential code associated with the public identifier. The temporary data is transmitted to at least one terminal of the delegated user or of another user.

A virtual payment system for paying for goods, services and content ordered over an internetwork is disclosed. The virtual payment system includes a commerce gateway. Buyers and sellers becomes registered participants by applying for virtual payment buyer and seller accounts. Once an account is established with the commerce gateway, a digital certificate is stored on the registered participant's computer. A buyer can then order a product, i.e., goods, services or content from a seller and charge it to the virtual payment account. When the product is shipped, the seller notifies the commerce gateway, which applies the charges to the buyer's virtual payment account. The buyer can settle the charges using a prepaid account, a credit account, or by using reward points earned through use of the virtual payment account. A buyer may create sub-accounts.

A method, a computer device, and a non-transitory computer-readable recording medium for preventing an erroneous deposit of cryptocurrency are provided. A method of preventing an erroneous deposit of cryptocurrency includes providing an interface for inputting transaction request information including a target coin and a wallet address; verifying at least one of the target coin and the wallet address using a trading environment of a target exchange corresponding to the transaction request information; and processing a transaction according to the transaction request information based on a verification result.

A computer-implemented method, non-transitory, computer-readable medium, and computer-implemented system are provided for deploying a smart contract in a blockchain network. The computer-implemented method includes: receiving, by a blockchain node in a blockchain network, a transaction for creating a smart contract, wherein the transaction comprises machine codes of the smart contract, and the machine codes of the smart contract are obtained by a compilation service provider performing Ahead of Time (AoT) compilation on bytecodes of the smart contract; determining, by the blockchain node, that the machine codes of the smart contract are obtained by a trusted compilation service provider; and in response to determining that the machine codes of the smart contract are obtained by the trusted compilation service provider, completing, by the blockchain node, a deployment of the smart contract.