Electronics and Telecommunications Research Institute

Jin-Tae Oh

Ki-Young Kim

Joon-Young Park

Young-Chang Kim

Jong-Choul Yim

Dong-Oh Kim

Chang-Hyun Lee

Disclosed are an apparatus and method for electing a committee node in a blockchain. The apparatus for electing a committee node in a blockchain is configured to transmit a staking transaction including validator information to a blockchain system to register a validator node, generate a draw pool for electing a committee node based on the validator information, change entries of the draw pool using a predefined shuffling algorithm, select a preset number of top entries as votes of a committee member from among the entries of the shuffled draw pool, and elect, as the committee node, the validator node that has acquired votes of a committee.

Apparatus and method for electing committee node in blockchain

A method for selecting a consensus node in an apparatus for generating a blockchain includes reading a nonce from the nonce chain of a node, performing an operation on the read nonce and previous height information, and comparing the result of the operation with a reference value in order to select the node as a consensus node.

Method and apparatus for selecting distributed consensus node based on proof of nonce

Disclosed herein are an apparatus and method for apparatus for synchronizing consensus node information in a blockchain network. The apparatus for synchronizing consensus node information includes one or more processors, and execution memory for storing at least one program that is executed by the one or more processors, wherein the at least one program is configured to receive a committed message for block consensus from the blockchain network and verify nodes participating in the block consensus, set a block number required to participate in the block consensus to a block size of a start block of a section corresponding to the block consensus, and broadcast consensus node information including the block number to the blockchain network.

Apparatus and method for synchronizing consensus node information in blockchain network

Disclosed herein are an apparatus and method for distributed consensus using multi-signature. The apparatus includes one or more processors and executable memory for storing at least one program executed by the one or more processors. The at least one program may send a Pre-Prepare message for processing distributed consensus on a transaction to nodes participating in the distributed consensus in a blockchain network, verify the nodes using message authentication code values included in Prepare messages received from the nodes, send the nodes an A-Prepare message for announcing that the Prepare messages are received from a number of verified nodes equal to or greater than a quorum required for the distributed consensus, generate a multi-signature value using multi-signature fragment values included in Commit messages received from the nodes, and send an A-Commit message including the multi-signature value to the nodes, thereby processing consensus on the transaction.

Apparatus and method for processing distributed consensus using multi-signature

Disclosed herein is a method for generating a blockchain, which includes selecting, by a first master node that generated a first block, second candidate nodes from a node pool according to a consensus node selection scheme using a nonce, and selecting, by the first master node, a second master node using the result of a vote taken by first candidate nodes. Here, among candidate blocks generated by the second candidate nodes, the candidate block generated by the second master node is locked as a second block.

Method for selecting consensus node using nonce and method and apparatus for generating blockchain using the same

Disclosed herein are an apparatus and method for achieving distributed consensus based on decentralized Byzantine fault tolerance. The apparatus may include one or more processors and an execution memory for storing at least one program that is executed by the one or more processors, wherein the program is configured to receive delegate request messages, each including a first transaction for requesting distributed consensus proposed by a client, and determine congress candidate nodes forming a consensus quorum, to be consensus nodes based on the delegate request messages, generate a prepare message that includes a second transaction for obtaining consent to results of determination of the consensus nodes, and send the prepare message to the consensus nodes, and receive commit messages, each including an electronic signature of a corresponding consensus node, from the respective consensus nodes, and broadcast a reply message indicative of results of verification of the electronic signatures.

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Daejeon, South Korea

Jin-Tae Oh