# The Chain ID

Every chain has a unique identifier (also called Chain ID). Tendermint and Tendermint-based applications have defined Chain IDs in the [Genesis.json](https://docs.tendermint.com/master/spec/core/genesis.html#genesis-fields) fields. To comply with both EIP155 and Cosmos standards for chain upgrades, Vince Chain-based chains use a special format for their unique identifiers.


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