International Business Machines Corporation

Guillermo R Lopez

Jeronimo Irazabal

Andres Garagiola

Dulce Beatriz Ponceleon

Diego A Masini

John B Geagan, Iii

Raul Laprida

An example operation may include one or more of storing a broadcast encryption tree comprising a set of cryptographic keys disposed in a hierarchical tree format, distributing a partial set of keys from the broadcast encryption tree to each respective peer from among a group of peers included in a blockchain network, receiving, from a user device, an identification of at least one peer included in the group of peers for processing a blockchain transaction, selecting a subset of keys from among the set of cryptographic keys in the broadcast encryption tree which enables at least one peer to decrypt transactions and doesn't enable the remaining peers included in the group of peers to decrypt transactions, and transmitting broadcast encryption information about the selected subset of keys to the user device for performing encryption of the transactions.

Blockchain transaction privacy enhancement through broadcast encryption

An example operation may include one or more of identifying a blockchain transaction, storing the blockchain transaction in a blockchain, assigning the blockchain transaction a transaction number and a block number, hashing a portion of blockchain transaction data associated with the blockchain transaction, and updating a blockchain index based on the hashed portion of the blockchain transaction.

Optimizing queries and other retrieve operations in a blockchain

An example operation may include one or more of receiving, by a committer node or peer of a blockchain network, a block comprising a lock request that locks a partial state of a smart contract, the lock request comprising a submitter identifier and a lock delay, the committer node or peer configured to process blocks of transactions, the method further comprising, validating the lock request, committing transactions comprising the submitter identifier with no delay, and committing transactions not comprising the submitter identifier after the lock delay.

Growing community of inventors

Manuel Gonnet, Argentina

Guillermo R Lopez