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BIP62: Make OP_0 a validly encoded signature #132

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laanwj merged 1 commit into from
Mar 11, 2015
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BIP62: Make OP_0 a validly encoded signature #132

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2 changes: 1 addition & 1 deletion bip-0062.mediawiki
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Expand Up @@ -38,7 +38,7 @@ The first six and part of the seventh can be fixed by extra consensus rules, but
===New rules===

Seven extra rules are introduced, to combat exactly the seven first sources of malleability listed above:
# '''Canonically encoded ECDSA signatures''' An ECDSA signature passed to OP_CHECKSIG, OP_CHECKSIGVERIFY, OP_CHECKMULTISIG or OP_CHECKMULTISIGVERIFY must be encoded using strict DER encoding. Doing a verification with a non-DER signature makes the entire script evaluate to False (not just the signature verification). See reference: [[#der-encoding|DER encoding]].
# '''Canonically encoded ECDSA signatures''' An ECDSA signature passed to OP_CHECKSIG, OP_CHECKSIGVERIFY, OP_CHECKMULTISIG or OP_CHECKMULTISIGVERIFY must be encoded using strict DER encoding. To provide a compact way to delibrately create an invalid signature for with OP_CHECKSIG and OP_CHECKMULTISIG the empty byte array (the result of OP_0) is also allowed. Doing a verification with a non-DER signature makes the entire script evaluate to False (not just the signature verification). See reference: [[#der-encoding|DER encoding]].
# '''Non-push operations in scriptSig''' Only data pushes are allowed in scriptSig. Evaluating any other operation makes the script evaluate to false. See reference: [[#push-operators|Push operators]].
# '''Push operations in scriptSig of non-standard size type''' The smallest possible push operation must be used when possible. Pushing data using an operation that could be encoded in a shorter way makes the script evaluate to false. See reference: [[#push-operators|Push operators]].
# '''Zero-padded number pushes''' Any time a script opcode consumes a stack value that is interpreted as a number, it must be encoded in its shortest possible form. 'Negative zero' is not allowed. See reference: [[#numbers|Numbers]].
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