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Merge bitcoin#15846: [POLICY] Make sending to future native witness o…
…utputs standard c634b1e [POLICY] Make sending to future native witness outputs standard (Pieter Wuille) Pull request description: As discussed in the April 18 2019 IRC meeting. This makes sending to future Segwit versions via native outputs (bech32) standard for relay, mempool acceptance, and mining. The reasons are: * This may interfere with smooth adoption of future segwit versions, if they're defined (by the sender wallet/node). * It violates BIP173 ("Version 0 witness addresses are always 42 or 62 characters, but implementations MUST allow the use of any version."), though admittedly this code was written before BIP173. * It doesn't protect much, as P2SH-embedded segwit cannot be filtered in this way. * As a general policy, the sender shouldn't care what the receiver likes his outputs to be. Note that _spending_ such outputs (including P2SH-embedded ones) remains nonstandard, as that is actually required for softfork safety. ACKs for commit c634b1: MarcoFalke: utACK c634b1e harding: Tested ACK c634b1e meshcollider: utACK bitcoin@c634b1e Tree-SHA512: e37168a1be9f445a04d4280593f0a92bdae33eee00ecd803d5eb16acb5c9cfc0f1f0a1dfbd5a0cc73da2c9928ec11cbdac7911513a78f85b789ae0d00e1b5962
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