How can I create an anyone-can-spend transaction using p2pkh outputs?
Also how would such a transaction in hex look like?
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If it's a P2PKH output, it's not anyone-can-spend. P2PKH implies there is a public key that needs to sign for spending.
You can use a P2SH or P2WSH output which sends to an OP_TRUE script, though.
You can also manually craft a transaction with a scriptPubKey that is literally OP_TRUE. No address corresponds to such an output, so you couldn't use off the shelf wallet software for it.
Pieter Wuille
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So how can i create an anyone can spend transaction? – Errol Mar 27 '18 at 01:49
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1I've expanded the answer a bit. – Pieter Wuille Mar 27 '18 at 02:38
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You also have how the transaction will look like (the P2SH Pieter referred to) in a question you asked a few days ago: https://bitcoin.stackexchange.com/q/72773/30668 – sr_gi Mar 27 '18 at 08:38
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For a P2PKH anyone-can-spend, just send to the address 1BgGZ9tcN4rm9KBzDn7KprQz87SZ26SAMH -- its private key is the integer 1, or in WIF format, KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rFU73sVHnoWn. Anyone can spend from this address since the private key is known to all.
Mark Lundeberg
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3I don't think "the private key is known" is actually the answer he's looking for. – Tiago Loriato Simões Mar 29 '19 at 03:50