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WIP, needs bitcoindevkit/bdk#2097
This PR adds a birthday to the wallet, as a
BlockId. Block-by-Block and CBF scanning can use this as a hint to only scan from the birthday onwards, saving time and bandwidth on full-scans where the birthday is previously known.Client code should be updated to automatically set the birthday when performing a full-scan.
TODO
bitcoind_rpcexample that uses the birthday as thestart_height