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BIP141 script failure clarifications

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Footnotes to clarify some special conditions which witness scripts will fail
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Johnson Lau 2016-06-07 01:34:19 +08:00
parent a57a7c62f4
commit d34877f482
1 changed files with 2 additions and 2 deletions
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@ -98,9 +98,9 @@ If the version byte is 0, and the witness program is 32 bytes:
* The <code>witnessScript</code> is deserialized, and executed after normal script evaluation with the remaining witness stack (≤ 520 bytes for each stack item).
* The script must not fail, and result in exactly a single TRUE on the stack.
If the version byte is 0, but the witness program is neither 20 nor 32 bytes, the script must fail.
If the version byte is 0, but the witness program is neither 20 nor 32 bytes, the script must fail.<ref>For example, a scriptPubKey with OP_0 followed by a 40-byte non-zero data push will fail due to incorrect program size. However, a scriptPubKey with OP_0 followed by a 41-byte non-zero data push will pass, since it is not considered to be a witness program</ref>
If the version byte is 1 to 16, no further interpretation of the witness program or witness happens, and there is no size restriction for the witness. These versions are reserved for future extensions.
If the version byte is 1 to 16, no further interpretation of the witness program or witness happens, and there is no size restriction for the witness. These versions are reserved for future extensions.<ref>For backward compatibility, for any version byte from 0 to 16, the script must fail if the witness program has a <code>CastToBool</code> value of zero. However, having a hash like this is a successful preimage attack against the hash function, and the risk is negligible.</ref>
=== Other consensus critical limits ===