Forced valid signature in old transaction

[grau]

While revalidating the entire chain using my independent implementation I found that transaction:

70f7c15c6f62139cc41afa858894650344eda9975b46656d893ee59df8914a3d

validates only if the S value of the signature is forced positive, it seems the ASN.1 coding of the signature in the Satoshi client (probably OpenSSL) is not precise.

Here the wire dump of the involved transactions:

spend:

Code:

0100000001289eb02e8ddc1ee3486aadc1cd1335fba22a8e3e87e3f41b7c5bbe7fb4391d81010000008a47304402206b5c3b1c86748dcf328b9f3a65e10085afcf5d1af5b40970d8ce3a9355e06b5b0220cdbdc23e6d3618e47056fccc60c5f73d1a542186705197e5791e97f0e6582a32014104f25ec495fa21ad14d69f45bf277129488cfb1a339aba1fed3c5099bb6d8e9716491a14050fbc0b2fed2963dc1e56264b3adf52a81b953222a2180d48b54d1e18ffffffff0140420f00000000001976a914e6ba8cc407375ce1623ec17b2f1a59f2503afc6788ac00000000

source:

Code:

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

[Mike Hearn]

Yes, we know. You may wish to talk to Matt Corallo or read his "newscripts" branch of bitcoinj. He has discovered many of these things already.