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https://blockexplorer.com/block/ 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f Using the Bitcoin Core reference client on the command-line: $ bitcoind getblock 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f { "hash" : "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f", "confirmations" : 308321, "size" : 285, "height" : 0, "version" : 1, "merkleroot" : "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b", "tx":[ "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b" ], "time" : 1231006505, "nonce" : 2083236893, "bits" : "1d00ffff", "difficulty" : 1.00000000, "nextblockhash" : "00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048" } The genesis block contains a hidden message within it. The coinbase transaction input contains the text “The Times 03/Jan/2009 Chancellor on brink of second bailout for banks”. This message provides proof of the earliest date this block was created, by ref‐ erencing the headline of the british newspaper The Times. It also serves as a tongue-in- cheek reminder of the importance of an independent monetary system, with bitcoin’s launch occurring at the same time as an unprecedented worldwide monetary crisis. The message was embedded in the first block by Satoshi Nakamoto, bitcoin’s creator. Linking Blocks in the Blockchain Bitcoin nodes maintain a local copy of the blockchain, starting at the genesis block. The local copy of the blockchain is constantly updated as new blocks are found and used to extend the chain. As a node receives incoming blocks from the network, it will validate these blocks and then link them to the existing blockchain. To establish a link, a node will examine the incoming block header and look for the “previous block hash”. Let’s assume, for example, that a node has 277,314 blocks in the local copy of the block‐ chain. The last block the node knows about is block 277,314, with a block header hash of 00000000000000027e7ba6fe7bad39faf3b5a83daed765f05f7d1b71a1632249. The bitcoin node then receives a new block from the network, which it parses as follows: { "size" : 43560, "version" : 2, "previousblockhash" : Linking Blocks in the Blockchain | 167PDF Image | Mastering Bitcoin
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