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We have supported sending to any witness version since Electrum 3.0, using addresses as specified in BIP-0173 (bech32 encoding). BIP-0350 makes a breaking change in address encoding, and recommends using (and using only) a new encoding (bech32m) for sending to witness version 1 and later. The address encoding for currently in use witness v0 addresses remains the same, as in BIP-0173; following the BIP-0350 spec. closes https://github.com/spesmilo/electrum/issues/6949 related: https://github.com/bitcoin/bips/blob/cd3885c0fb9d140b111ff729294400ff5dcfc8e3/bip-0350.mediawiki https://github.com/bitcoin/bitcoin/pull/20861