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I understand that P2SH addresses are used to allow "segwit unaware" wallets to create outputs spendable by segwit wallets (please correct me if I got something wrong). For new clients I think I got it: they will check that the script cointaned in the witness matches the script hash and execute it.
What I do not understand is how this output is spendable by a segwit aware client to the eyes of an old client. Because it clearly doesn't look like an anyone can spend. How does it work?
Thanks.
Why doesn't it look like an anyone can spend? – Osias Jota – 2018-03-15T22:21:35.350
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My statement came from the belief that the p2sh address was generated by encoding hash160 <witness program hash> op_equal. I found this: https://github.com/bitcoinbook/bitcoinbook/issues/440 . This means that decoding it makes it an anyone can spend for old clients right?
– domegabri – 2018-03-15T23:26:48.593In addition to the previous comment: https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#p2wpkh-nested-in-bip16-p2sh . Segwit clients use a non-empty scriptSig when spending outputs received from old clients.
– domegabri – 2018-03-16T17:39:27.687