The chain_id of the blockchain.
"1" means Ethereum;
"10" means Optimism;
"25" means Cronos;
"56" means BSC;
"66" means OKC;
"100" means Gnosis;
"128" means HECO;
"137" means Polygon;
"250" means Fantom;
"321" means KCC;
"324" means zkSync Era;
"10001" means ETHW;
"201022" means FON;
"42161" means Arbitrum;
"43114" means Avalanche;
"59144" means Linea Mainnet;
"534352" means Scroll;
"204" means opBNB;