Mastering Bitcoin

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Mastering Bitcoin ( mastering-bitcoin )

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$ bitcoin-cli backupwallet wallet.backup $ Now, to restore the backup file, use the importwallet command. If your wallet is locked, you will need to unlock it first (see walletpassphrase above) in order to import the backup file: $ bitcoin-cli importwallet wallet.backup $ The dumpwallet command can be used to dump the wallet into a text file that is human- readable: $ bitcoin-cli dumpwallet wallet.txt $ more wallet.txt # Wallet dump created by Bitcoin v0.9.0rc1-beta (2014-01-31 09:30:15 +0100) # * Created on 2014-02- 8dT20:34:55Z # * Best block at time of backup was 286234 (0000000000000000f74f0bc9d3c186267bc45c7b91c49a0386538 # mined on 2014-02- 8dT20:24:01Z KzTg2wn6Z8s7ai5NA9MVX4vstHRsqP26QKJCzLg4JvFrp6mMaGB9 2013-07- 4dT04:30:27Z change=1 # addr=16pJ6Xk Kz3dVz7R6mUpXzdZy4gJEVZxXJwA15f198eVui4CUivXotzLBDKY 2013-07- 4dT04:30:27Z change=1 # addr=17oJds8 [... many more keys ...] $ Wallet addresses and receiving transactions Commands: getnewaddress, getreceivedbyaddress, listtransactions, getaddressesbyac‐ count, getbalance The bitcoin reference client maintains a pool of addresses, the size of which is displayed by keypoolsize when you use the command getinfo. These addresses are generated automatically and can then be used as public receiving addresses or change addresses. To get one of these addresses, you can use the getnewaddress command: $ bitcoin-cli getnewaddress 1hvzSofGwT8cjb8JU7nBsCSfEVQX5u9CL Now, we can use this address to send a small amount of bitcoin to our bitcoind wallet from an external wallet (assuming you have some bitcoin in an exchange, web wallet or other bitcoind wallet held elsewhere). For this example, we will send 50 milliBits (0.050 bitcoin) to the address returned above. We can now query the bitcoind client for the amount received by this address, and specify how many confirmations are required before an amount is counted in that bal‐ ance. For this example, we will specify zero confirmations. A few seconds after sending the bitcoin from another wallet, we will see it reflected in the wallet. We use getrecei vedbyaddress with the address and the number of confirmations set to zero (0): Using Bitcoin Core’s JSON-RPC API from the command line | 43

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