# IoTeX Chain ID
A Chain ID is a unique number assigned to different, independent IoTeX Blockchains. For example, IoTeX Mainnet chain has Chain ID = 1
, while IoTeX Testnet has Chain ID = 2
. Chain IDs in IoTeX are used for security reasons, by including it into transaction signature to prevent transaction replay attacks on different networks.
# List of IoTeX Chain ID's
All IoTeX-based blockchains should adopt this Chain ID Mechanism, but replacing CHAIN ID
with a different and unique value. All testnet, consortium and IoTeX-cloned chains are encouraged to do the same:
CHAIN ID | Chain |
---|---|
1 | IoTeX Mainnet |
2 | IoTeX Testnet |