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TermDefinition
BlockA data structure made up of one or more transactions. Multiple blocks make up the blockchain.
BlockchainA distributed ledger technology constructed by a chronological chain of blocks.
Chain
CryptographyThe study of techniques used to allow secure communication between different parties. Cryptography ensures both the authenticity and the immutability of data on a blockchain.
Hash
Key Pairs
Digital Certificate
Permissioned
Consensus

A consensus algorithm is a process in computer science used to achieve agreement on a single data value among distributed processes or systems. Consensus algorithms are designed to achieve reliability in a network involving multiple unreliable nodes. Solving that issue – known as the consensus problem – is important in distributed computing and multi-agent systems.

Consensus, as an algorithm

An algorithm to achieve agreement on a block among peers in the network. By having it in the system, reliability is increased.

Consensus, as a component

Preserves consistent state among the peers within a peer network. Iroha uses own consensus algorithm called Yet Another Consensus (aka YAC). Distinctive features of this algorithm are its scalability, performance, and Byzantine fault tolerance. If there are missing blocks, they will be downloaded from another peer via Synchronizer. Committed blocks are stored in Ametsuchi block storage.

Transaction
World State
Channel
Immutability
Trust
Governance
Node
Peer
Chaincode
Ledger






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