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The getblock, getblockhash and gettransaction commands can be used to explore the blockchain database, programmatically. Creating, signing and submitting transactions based on unspent outputs Commands: listunspent, gettxout, createrawtransaction, decoderawtransaction, sign‐ rawtransaction, sendrawtransaction Bitcoin’s transactions are based on the concept of spending “outputs”, which are the result of previous transactions, to create a transaction chain that transfers ownership from address to address. Our wallet has now received a transaction that assigned one such output to our address. Once this is confirmed, we can now spend that output. First, we use the listunspent command to show all the unspent confirmed outputs in our wallet: $ bitcoin-cli listunspent [ { "txid" : "9ca8f969bd3ef5ec2a8685660fdbf7a8bd365524c2e1fc66c309acbae2c14ae3", "vout" : 0, "address" : "1hvzSofGwT8cjb8JU7nBsCSfEVQX5u9CL", "account" : "", "scriptPubKey" : "76a91407bdb518fa2e6089fd810235cf1100c9c13d1fd288ac", "amount" : 0.05000000, "confirmations" : 7 } ] We see that the transaction 9ca8f9... created an output (with vout index 0) assigned to the address 1hvzSo... for the amount of 50 millibits, which at this point has received 7 confirmations. Transactions use previously created outputs as their inputs by referring to them by the previous txid and vout index. We will now create a transaction that will spend the 0th vout of the txid 9ca8f9... as its input and assign it to a new output that sends value to a new address. First, let’s look at the specific output in more detail. We use the gettxout to get the details of this unspent output above. Transaction outputs are always referenced by txid and vout, and these are the parameters we pass to gettxout: $ bitcoin-cli gettxout 9ca8f969bd3ef5ec2a8685660fdbf7a8bd365524c2e1fc66c309acbae2c14ae3 0 { 50 | "bestblock" : "0000000000000001405ce69bd4ceebcdfdb537749cebe89d371eb37e13899fd9", "confirmations" : 7, "value" : 0.05000000, "scriptPubKey" : { "asm" : "OP_DUP OP_HASH160 07bdb518fa2e6089fd810235cf1100c9c13d1fd2\ Chapter 3: The Bitcoin ClientPDF Image | Mastering Bitcoin
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