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I need to know how the blockchain loopkup works like blockchain-info. I need to also know how web3 api works, how does it interfaces with the blockchain? What is the protocol that web3 uses?

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Web3 uses the JSON-RPC API to talk to the Ethereum node (geth, parity, ethereumj, etc).

  • can we say "JSON-RPC" is a protocole ? like HTTP ? – maroodb Jul 4 '18 at 11:08
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    From jsonrpc.org it is: A light weight remote procedure call protocol. – Ismael Jul 4 '18 at 13:21

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