Patent ID: 11902451
Assignee: FUJITSU LIMITED
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. The non-transitory computer-readable medium of claim 6, wherein the operations further comprise:
providing the identifier to a plurality of identity provider systems, the plurality of identity provider systems providing identity verification for a plurality of blockchains that includes the first blockchain and the second blockchain and each of the identity provider systems including a different share of a master secret key associated with a master public key; and
obtaining a system signature from each of the plurality of identity provider systems, each of the system signatures generated using the identifier and one of the shares of the master secret key, wherein the first secret key is generated based on the identifier and a combination of the system signatures and wherein the signature is verifiable by the device using the string and the identifier obtained from one or more of the first block or the second block by the device and the master public key.