International Business Machines Corporation
Privacy-preserving endorsements in blockchain transactions

Abstract:

Described are techniques for privacy-preserving endorsements in blockchain transactions. The techniques include a method comprising associating a ledger key in a local collection with an ephemeral key, where the ephemeral key is a re-randomization of a key associated with a first organization. The method further comprises generating, by a first peer associated with the first organization, an anonymous endorsement of a transaction in a blockchain using the ephemeral key. The method further comprises determining, by a second peer associated with the first organization, that the first peer endorsed the transaction. The method further comprises retrieving, by the second peer, a preimage from the first peer. The method further comprises providing information including the anonymous endorsement and the transaction to a second organization associated with the blockchain, where the anonymous endorsement is anonymous to peers associated with the second organization.