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公链 | scan | 扫链 | sdk | 水龙头 :----| :----: | ----: | ----: | ----: ethereum|https://goerli.etherscan.io/| Subgraph | web3.js/ethers.js | Cardano|https://preprod.cardanoscan.io/|https://csnapshots.io/mainnet | https://www.blockscout.com/ | https://docs.cardano.org/cardano-testnet/tools/faucet Cosmos|Y|主键 | Subgraph | Iotx|Y|主键 | Subgraph |