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The sentence regarding allowing empty byte arrays to indicate an invalid ECDSA signature is confusing. I attempted to make it clearer. If I screwed it up or can make it even clearer, please let me know.
Thank you.
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petertodd/bip62-compact-validly-encoded-invalid-sigs
BIP62: Make OP_0 a validly encoded signature
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Previously BIP62 did not provide a compact way to delibrately encode an
invalid signature. For example in BIP19 if m != n with this change you
can provide compact OP_0's in the scriptSig rather than lengthy
DER-encoded signatures.
Note that we may want to further expand on this change in the future by
saying that only OP_0 is a "valid" invalid signature; BIP19 even with
this change is inherently malleable as the invalid signatures can be any
validly encoded DER signature.
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This came up on the mailing list.
yyyy-mm-dd (ISO 8601) is the internationally accepted format for numeric
dates. This commit changes all BIPs to use that instead of dd-mm-yyyy.
It also updates BIP 0001 to prescribe the new format.
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