flow-models/models/descriptions/chain_id.md

{% docs chain_id %} The unique identifier for the blockchain network (chain) where the block or transaction was recorded. Data type: STRING. On Flow, this value distinguishes between different network deployments (e.g., mainnet, testnet). Used for cross-network analytics and ensuring data integrity when working with multiple environments. Example: 'flow-mainnet' or 'flow-testnet'. {% enddocs %}