Mastering Bitcoin

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Mastering Bitcoin ( mastering-bitcoin )

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walletlock walletpassphrase "passphrase" timeout walletpassphrasechange "oldpassphrase" "newpassphrase" Getting information on the Bitcoin Core client status Commands: getinfo Bitcoin’s getinfo RPC command shows us basic information about the status of the bitcoin network node, the wallet and the blockchain database. We use bitcoin-cli to run it: $ bitcoin-cli getinfo { "version" : 90000, "protocolversion" : 70002, "walletversion" : 60000, "balance" : 0.00000000, "blocks" : 286216, "timeoffset" : -72, "connections" : 4, "proxy" : "", "difficulty" : 2621404453.06461525, "testnet" : false, "keypoololdest" : 1374553827, "keypoolsize" : 101, "paytxfee" : 0.00000000, "errors" : "" } The data is returned in JavaScript Object Notation (JSON), a format which can easily be “consumed” by all programming languages but is also quite human-readable. Among this data we see the version numbers for the bitcoin software client (90000), protocol (70002) and wallet (60000). We see the current balance contained in the wallet, which is zero. We see the current block height, showing us how many blocks are known to this client, 286216. We also see various statistics about the bitcoin network and the settings related to this client. We will explore these settings in more detail in the rest of this chapter. It will take some time, perhaps more than a day, for the bitcoind client to “catch up” to the current blockchain height as it downloads blocks from other bitcoin clients. You can check its current progress using getinfo to see the number of known blocks. Wallet setup and encryption Commands: encryptwallet, walletpassphrase Using Bitcoin Core’s JSON-RPC API from the command line | 41

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