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Mastering Bitcoin

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Mastering Bitcoin ( mastering-bitcoin )

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"0568f4fad1fdeff4dc70b106b0f0ec7827642c05fe5d2295b9deba4f5c5f5168", "9194bfe5756c7ec04743341a3605da285752685b9c7eebb594c6ed9ec9145f86", "765038fc1d444c5d5db9163ba1cc74bba2b4f87dd87985342813bd24021b6faf", "bff1caa9c20fa4eef33877765ee0a7d599fd1962417871ca63a2486476637136", "d76aa89083f56fcce4d5bf7fcf20c0406abdac0375a2d3c62007f64aa80bed74", "e57a4c70f91c8d9ba0ff0a55987ea578affb92daaa59c76820125f31a9584dfc", "9ca8f969bd3ef5ec2a8685660fdbf7a8bd365524c2e1fc66c309acbae2c14ae3", #[... many more transactions ...] ], "time" : 1392660808, "nonce" : 3888130470, "bits" : "19015f53", "difficulty" : 3129573174.52228737, "chainwork" : "000000000000000000000000000000000000000000001931d1658fc04879e466", "previousblockhash" : "0000000000000000177e61d5f6ba6b9450e0dade9f39c257b4d48b4941ac77e7", "nextblockhash" : "0000000000000001239d2c3bf7f4c68a4ca673e434702a57da8fe0d829a92eb6" } The block contains 367 transactions and as you see above, the 18th transaction listed (9ca8f9...) is the txid of the one crediting 50 milliBits to our address. The height entry tells us this is the 286384th block in the blockchain. We can also retrieve a block by its block height using the getblockhash command, which takes the block height as the parameter and returns the block hash for that block: $ bitcoin-cli getblockhash 0 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f Above, we retrieve the block hash of the “genesis block”, the first block mined by Satoshi Nakamoto, at height zero. Retrieving this block shows: $ bitcoin-cli getblock 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f { "hash" : "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f", "confirmations" : 286388, "size" : 285, "height" : 0, "version" : 1, "merkleroot" : "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b", "tx":[ "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b" ], "time" : 1231006505, "nonce" : 2083236893, "bits" : "1d00ffff", "difficulty" : 1.00000000, "chainwork" : "0000000000000000000000000000000000000000000000000000000100010001", "nextblockhash" : "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048" } Using Bitcoin Core’s JSON-RPC API from the command line | 49

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