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myarbrough@oreilly.com 2014-11-18 08:09:58 -08:00
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@ -574,12 +574,12 @@ P2SH addresses hide all of the complexity, so that the person making a payment d
As of version 0.9.2 of the Bitcoin Core client, P2SH transactions can contain any valid script, making the P2SH standard much more flexible and allowing for experimentation with many novel and complex types of transactions. As of version 0.9.2 of the Bitcoin Core client, P2SH transactions can contain any valid script, making the P2SH standard much more flexible and allowing for experimentation with many novel and complex types of transactions.
Note that you are not able to put a P2SH inside a P2SH redeem script, because the P2SH specification is not recursive. You are also still not be able to use +OP_RETURN+ in a redeem script because +OP_RETURN+ cannot be redeemed by definition. Note that you are not able to put a P2SH inside a P2SH redeem script, because the P2SH specification is not recursive. You are also still not able to use +OP_RETURN+ in a redeem script because +OP_RETURN+ cannot be redeemed by definition.
Note that because the redeem script is not presented to the network until you attempt to spend a P2SH output, if you lock an output with the hash of an invalid transaction it will be processed regardless. However, you will not be able to spend it because the spending transaction, which includes the redeem script, will not be accepted because it is an invalid script. This creates a risk, because you can lock bitcoin in a P2SH that cannot be spent later. The network will accept the P2SH encumbrance even if it corresponds to an invalid redeem script, because the script hash gives no indication of the script it represents. Note that because the redeem script is not presented to the network until you attempt to spend a P2SH output, if you lock an output with the hash of an invalid transaction it will be processed regardless. However, you will not be able to spend it because the spending transaction, which includes the redeem script, will not be accepted because it is an invalid script. This creates a risk, because you can lock bitcoin in a P2SH that cannot be spent later. The network will accept the P2SH encumbrance even if it corresponds to an invalid redeem script, because the script hash gives no indication of the script it represents.
[WARNING] [WARNING]
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((("Pay-to-Script-Hash (P2SH)","locking scripts")))P2SH locking scripts contain the hash of a redeem script, which gives no clues as to the content of the redeem script itself. The P2SH transaction will be considered valid and accepted even if the redeem script is invalid. You may accidentally lock bitcoin in such a way that it cannot later be spent.(((range="endofrange", startref="ix_ch05-asciidoc19")))(((range="endofrange", startref="ix_ch05-asciidoc18")))(((range="endofrange", startref="ix_ch05-asciidoc17")))(((range="endofrange", startref="ix_ch05-asciidoc0"))) ((("Pay-to-Script-Hash (P2SH)","locking scripts")))P2SH locking scripts contain the hash of a redeem script, which gives no clues as to the content of the redeem script itself. The P2SH transaction will be considered valid and accepted even if the redeem script is invalid. You might accidentally lock bitcoin in such a way that it cannot later be spent.(((range="endofrange", startref="ix_ch05-asciidoc19")))(((range="endofrange", startref="ix_ch05-asciidoc18")))(((range="endofrange", startref="ix_ch05-asciidoc17")))(((range="endofrange", startref="ix_ch05-asciidoc0")))
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