add info on public key recovery
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@ -57,6 +57,9 @@ ECDSA.prototype.randomK = function() {
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return this;
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};
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// Information about public key recovery:
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// https://bitcointalk.org/index.php?topic=6430.0
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// http://stackoverflow.com/questions/19665491/how-do-i-get-an-ecdsa-public-key-from-just-a-bitcoin-signature-sec1-4-1-6-k
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ECDSA.prototype.sig2pubkey = function() {
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var i = this.sig.i;
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if (!(i === 0 || i === 1 || i === 2 || i === 3))
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