Glossary definition

Protocol

A blockchain protocol is a defined set of rules and software interfaces that participants follow to reach consensus or provide an onchain application service.

also: blockchain protocol, crypto protocol · reviewed July 22, 2026

A protocol is a foundation layer or set of rules that allows computers to share data. In cryptocurrency, blockchain protocols run on networks of peer-to-peer computers that follow the same rules and maintain matching copies of a transaction ledger. A consensus mechanism allows them to exchange value without a central intermediary.

Well-known blockchain protocols include:

  • Bitcoin
  • Ethereum
  • Solana
  • Hyperledger Fabric
  • Corda

Used in context

Articles using this term.