Nec Corporation

Alessandro Sforzin

Ghassan Karame

Wenting Li

Sebastien Andreina

Maja Schwarz

Sébastien Andreina

A method for supporting identity management of travelers in an airport using a distributed ledger system includes receiving, by a global identity blockchain, a registration request from a traveler via a traveler device. The registration request includes a commitment for identity data that is uploaded by the traveler in a secure cloud storage. The method further includes recording the commitment in the global identity blockchain, receiving, by the global identity blockchain, a result of an identity verification with respect to the traveler from a verifier entity, recording the result in the global identity blockchain, and receiving, by a security blockchain, a ticket registration transaction issued by an airline entity. The ticket registration transaction comprises a unique traveler ID of the traveler. The method further includes issuing, by the security blockchain, an access control list update upon reception of consent by the traveler.

Method and distributed ledger system for supporting identity management of travelers in an airport

A method for securing an interblockchain transaction includes receiving, from a first user application, a registration request including a first permissioned blockchain public key and a first permissionless blockchain public key. The method also includes performing, by the processing circuitry, receiving, from a second user application, a second registration request including a second permissioned blockchain public key and a second permissionless blockchain public key. The permissioned blockchain public keys are valid on the permissioned blockchain and the permissionless blockchain public keys are valid on the permissionless public blockchain. In addition, the method includes receiving, from the first user application, a transaction identification, the transaction identification identifying a first transfer transaction executed on the permissionless public blockchain. The transaction identification identifies the first and second permissionless blockchain public keys.

Delegated off-chain payments using cryptocurrencies

A method for enabling pruning of a blockchain of a blockchain network includes creating an active blocks commitments Merkle tree from hashes of active blocks and creating an active smart contracts commitments Merkle tree from hashes of active smart contracts. The Merkle trees are created after an amount of blocks created in the blockchain has reached a threshold set by a pruning threshold parameter stored in the blockchain network. Hashes of the roots of the Merkle trees are stored in a header of a new block as a new genesis block. The new genesis block is broadcast to the blockchain network. A set of the active blocks and active smart contracts used respectively to create the active blocks commitments Merkle tree and the active smart contracts commitments Merkle tree are committed to upon the blockchain network reaching consensus on the new genesis block.

Secure and transparent pruning for blockchains

A method of providing secure ledger distribution for interbank settlement includes maintaining a first consensus layer in a mainchain among a plurality of nodes of the centralized computer system and a second consensus layer in a first private sidechain among at least one node of the centralized computer system and computer systems of at least a first sender bank and a first receiver bank, each of which have an account with the central bank. A first transaction is received from the computer system of the first sender bank as a first payment request. It is determined that the first transaction is valid and consensus is reached on a distributed ledger in the mainchain. A first finality proof for the first transaction is forwarded to the first private sidechain. The first transaction is added to a first private ledger accessible only within the first private sidechain.

Method for secure ledger distribution and computer system using secure distributed ledger technology

A method for pruning a blockchain of a blockchain network includes creating an active blocks commitments Merkle tree from hashes of active blocks and creating an active smart contracts commitments Merkle tree from hashes of active smart contracts. The Merkle trees are created after an amount of blocks created in the blockchain has reached a threshold set by a pruning threshold parameter stored in the blockchain network. Hashes of the roots of the Merkle trees are stored in a header of a new block as a new genesis block. The new genesis block is broadcast to the blockchain network. A local copy of the blockchain is pruned at a pruning point in accordance with the pruning threshold parameter based on the blockchain network having reached consensus on the new genesis block.

A method of providing secure ledger distribution for interbank settlement includes establishing a private sidechain among a centralized computer system of a central bank and computer systems of at least a sender bank and a receiver bank, each of which have an account with the central bank. The centralized computer system receives a transaction from the computer system of the sender bank as a payment request. The centralized computer system determines whether the transaction is valid. Consensus is reached within the private sidechain. The centralized computer system forwards the transaction to the computer system of the receiver bank along with a finality proof. The accounts of the sender bank and the receiver bank are updated and the transaction is added to a private ledger accessible only within the private sidechain.

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Heidelberg, Germany

Alessandro Sforzin