Method and apparatus for generating description information

A non-transitory computer readable medium storing contents that, when executed by one or more processors, cause the one or more processors to perform actions comprising:

• determining a plurality of local decentralized identifiers (DIDs) registered in a first blockchain;
• generating a relationship graph of the plurality of local DIDs based on data that is related to individual local DIDs and that is maintained by a first node of a blockchain network that implements the first blockchain, wherein the data related to individual local DIDs includes data related to an external DID, and the data related to the external DID is obtained by the first node from another blockchain network based on a correspondence between a local DID and the external DID, wherein responsive to determining the external DID is a DID that is of an object represented by the local DID and that is registered in a second blockchain implemented by the another blockchain network, the first node records the correspondence between the local DID and the external DID by at least:
• receiving the external DID returned by a second node of the another blockchain network after a signed random character is verified by using an identity public key of an owner of the external DID, wherein the signed random character is signed by an owner of the local DID by using an identity private key and wherein the identity public key is recorded in a DID document corresponding to the external DID in the second blockchain;
• determining, from the relationship graph and based on a target local DID corresponding to a target object, an associated local DID related to the target local DID;
• and
• generating description information of the target object based on (a) an association relationship between the target local DID and the associated local DID and (b) data related to the associated local DID.

A system, comprising:

• one or more processors;
• and
• memory storing contents that, when executed by the one or more processors, cause the system to perform actions comprising:
• determining a plurality of local decentralized identifiers (DIDs) registered in a first blockchain;
• generating a relationship graph of the plurality of local DIDs based on data that is related to individual local DIDs and that is maintained by a first node of a blockchain network that implements the first blockchain, wherein the data related to individual local DIDs includes data related to an external DID, and the data related to the external DID is obtained by the first node from another blockchain network based on a correspondence between a local DID and the external DID, wherein responsive to determining the external DID is a DID that is of an object represented by the local DID and that is registered in a second blockchain implemented by the another blockchain network, the first node records the correspondence between the local DID and the external DID by at least:
• receiving the external DID returned by a second node of the another blockchain network after a signed random character is verified by using an identity public key of an owner of the external DID, wherein the signed random character is signed by an owner of the local DID by using an identity private key and wherein the identity public key is recorded in a DID document corresponding to the external DID in the second blockchain;
• determining, from the relationship graph and based on a target local DID corresponding to a target object, an associated local DID related to the target local DID;
• and
• generating description information of the target object based on (a) an association relationship between the target local DID and the associated local DID and (b) data related to the associated local DID.