Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based decentralized-identifier creation, are provided. One of the methods includes: obtaining a request for creating a decentralized identifier (DID), wherein the request comprises a public key of a cryptographic key pair; creating, based on the public key, a blockchain account associated with a blockchain; creating the DID based on information associated with the blockchain account; and returning a confirmation message comprising the created DID.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for verifiable-claim issuance. One of the methods includes: receiving, from a first entity, a request for creating a verifiable claim (VC) for a decentralized identifier (DID) associated with a second entity; obtaining, in response to receiving the request, a digital signature associated with the first entity; and generating the VC based on the received request and the obtained digital signature.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for claim verification. One of the methods includes: receiving, from a first entity, a request for verifying a verifiable claim (VC) that comprises a digital signature; obtaining, based on the VC, a public key associated with a second entity; determining that the digital signature is created based on a private key associated with the public key; and verifying the VC based on the determination.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for verifiable-claim issuance. One of the methods includes: receiving, from a first entity, a request for creating a verifiable claim (VC) for a decentralized identifier (DID) associated with a second entity; obtaining, in response to receiving the request, a digital signature associated with the first entity; and generating the VC based on the received request and the obtained digital signature.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for implementing a resolver service. One of the methods includes: obtaining, from a blockchain, event data for a plurality of blockchain transactions associated with a plurality of decentralized identifiers (DIDs); storing the event data in a database; receiving a request for information associated with the event data, wherein the request comprises one or more account identifiers; identifying one or more DIDs respectively corresponding to the one or more account identifiers based on pre-stored mapping relationships between the one or more DIDs and the one or more account identifiers; and providing, from the database, event data for one or more blockchain transactions associated with the identified one or more DIDs.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for decentralized-identifier creation. One of the methods includes: receiving a request from a first entity for obtaining a new decentralized identifier (DID) for a second entity; determining an existing DID associated with the first entity based on the request; generating a cryptographic key pair associated with the second entity comprising a public key and a private key; creating, based on the public key, a DID document associated with the new DID, wherein the DID document comprises the existing DID associated with the first entity; generating a blockchain transaction for adding the DID document to the blockchain; signing the blockchain transaction using the private key of the cryptographic key pair associated with the second entity; and sending, to a blockchain node associated with the blockchain, the signed blockchain transaction for the blockchain node to add to the blockchain.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based decentralized-identifier authentication, are provided. One of the methods includes: obtaining, from a computing device, a request for creating an authentication challenge for a decentralized identifier (DID); obtaining, from a blockchain network, a DID document corresponding to the DID; retrieving a public key associated with the DID from the received DID document; creating the authentication challenge by encrypting a piece of original text using the public key to create a piece of ciphertext; obtaining information associated with an authentication service endpoint for the DID from the received DID document; sending, to the authentication service endpoint according to the obtained information, the created authentication challenge.

Abstract: Disclosed are methods, systems, and media for block content editing in blockchains. One method includes: receiving a transaction to edit original content m of a block of a blockchain to target content m?, wherein a parent hash of the block is recorded in another block of the blockchain and generated based on the original content m, a public key H, and an original random number r; generating a private key X based on private keys x1 to xn; determining a target random number r? based on the original content m, the target block m?, the original random number r, and the private key X, wherein a hash value generated using the target content m?, the public key H, and the target random number r? is the same as the parent hash; and updating the original content m to the target content m?.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for verifiable-claim issuance. One of the methods includes: receiving, from a first entity, a request for creating a verifiable claim (VC) for a decentralized identifier (DID) associated with a second entity; obtaining, in response to receiving the request, a digital signature associated with the first entity; and generating the VC based on the received request and the obtained digital signature.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based decentralized-identifier creation, are provided. One of the methods includes: obtaining a request for creating a decentralized identifier (DID), wherein the request comprises a public key of a cryptographic key pair; creating, based on the public key, a blockchain account associated with a blockchain; creating the DID based on information associated with the blockchain account; and returning a confirmation message comprising the created DID.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based decentralized-identifier creation, are provided. One of the methods includes: obtaining a request for creating a decentralized identifier (DID), wherein the request comprises a public key of a cryptographic key pair; creating, based on the public key, a blockchain account associated with a blockchain; creating the DID based on information associated with the blockchain account; and returning a confirmation message comprising the created DID.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for claim verification. One of the methods includes: receiving, from a first entity, a request for verifying a verifiable claim (VC) that comprises a digital signature; obtaining, based on the VC, a public key associated with a second entity; determining that the digital signature is created based on a private key associated with the public key; and verifying the VC based on the determination.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for decentralized-identifier creation. One of the methods includes: receiving a request from a first entity for obtaining a new decentralized identifier (DID) for a second entity; determining an existing DID associated with the first entity based on the request; generating a cryptographic key pair associated with the second entity comprising a public key and a private key; creating, based on the public key, a DID document associated with the new DID, wherein the DID document comprises the existing DID associated with the first entity; generating a blockchain transaction for adding the DID document to the blockchain; signing the blockchain transaction using the private key of the cryptographic key pair associated with the second entity; and sending, to a blockchain node associated with the blockchain, the signed blockchain transaction for the blockchain node to add to the blockchain.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based decentralized-identifier authentication, are provided. One of the methods includes: obtaining, from a computing device, a request for creating an authentication challenge for a decentralized identifier (DID); obtaining, from a blockchain network, a DID document corresponding to the DID; retrieving a public key associated with the DID from the received DID document; creating the authentication challenge by encrypting a piece of original text using the public key to create a piece of ciphertext; obtaining information associated with an authentication service endpoint for the DID from the received DID document; sending, to the authentication service endpoint according to the obtained information, the created authentication challenge.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based decentralized-identifier creation, are provided. One of the methods includes: obtaining a request for creating a decentralized identifier (DID), wherein the request comprises a public key of a cryptographic key pair; creating, based on the public key, a blockchain account associated with a blockchain; creating the DID based on information associated with the blockchain account; and returning a confirmation message comprising the created DID.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for implementing a resolver service. One of the methods includes: obtaining, from a blockchain, event data for a plurality of blockchain transactions associated with a plurality of decentralized identifiers (DIDs); storing the event data in a database; receiving a request for information associated with the event data, wherein the request comprises one or more account identifiers; identifying one or more DIDs respectively corresponding to the one or more account identifiers based on pre-stored mapping relationships between the one or more DIDs and the one or more account identifiers; and providing, from the database, event data for one or more blockchain transactions associated with the identified one or more DIDs.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based decentralized-identifier creation, are provided. One of the methods includes: obtaining a request for creating a decentralized identifier (DID), wherein the request comprises a public key of a cryptographic key pair; creating, based on the public key, a blockchain account associated with a blockchain; creating the DID based on information associated with the blockchain account; and returning a confirmation message comprising the created DID.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for claim verification. One of the methods includes: receiving, from a first entity, a request for verifying a verifiable claim (VC) that comprises a digital signature; obtaining, based on the VC, a public key associated with a second entity; determining that the digital signature is created based on a private key associated with the public key; and verifying the VC based on the determination.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for implementing a resolver service. One of the methods includes: obtaining, from a blockchain, event data for a plurality of blockchain transactions associated with a plurality of decentralized identifiers (DIDs); storing the event data in a database; receiving a request for information associated with the event data, wherein the request comprises one or more account identifiers; identifying one or more DIDs respectively corresponding to the one or more account identifiers based on pre-stored mapping relationships between the one or more DIDs and the one or more account identifiers; and providing, from the database, event data for one or more blockchain transactions associated with the identified one or more DIDs.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for decentralized-identifier creation. One of the methods includes: receiving a request for obtaining a decentralized identifier (DID), wherein the request comprises an account identifier; obtaining, in response to receiving the request, a public key of a cryptographic key pair; obtaining the DID based on the public key; and storing a mapping relationship between the account identifier and the obtained DID.