Alter post, aber faszinierende Frage und Super Antwort (wie üblich) von David Schwartz. Aus Neugier, ich habe einen 'Briefumschlag' - Berechnung, um zu sehen, wie viel es Kosten würde, zu sammeln genug Rechenleistung, ziehen Sie einen 51% Angriff, wie David Schwartz beschreibt. Heute ist die hash-rate für die gesamte bitcoin-Netzwerk sind rund 600,000,000 GH/s. Mining-hardware, die das tun, 4700 GH/s schon für ~$2500. So, $320M kaufen konnte genug hardware in übereinstimmung mit dem aktuellen hash-Tarife für das gesamte Netzwerk. Nicht viel für die meisten souveränen Nationen (oder gut finanzierten Terrorgruppen). @MarkS. Die Antwort ist immer noch gefährlich falsch. Mit dieser interpretation, mein Beispiel ist ungültig, aber seine Logik noch gilt. Siehe meine Antwort für ein weiteres Beispiel, das gilt, wenn man nur Bitcoins kaufen, halten Sie Sie zurück, halten Sie, fallen Sie im Wert, und der Rücktritt gilt als eine bevorzugte übertragen und Umgekehrt. Interessant. Scheint ziemlich nutzlos, es sei denn, ich bin fehlt etwas.

Ich verwendete den folgenden code zum erzeugen einer korrekten Signatur:

public String Zeichen(String msg, BigInteger d) throws IOException {
 ECDSASigner signer = new ECDSASigner();
 X9ECParameters params = SECNamedCurves.getByName("secp256k1");
 ECDomainParameters ecDomainParameters = new ECDomainParameters(params.getCurve(), params.getG(), params.getN(), params.die getH());
 ECPrivateKeyParameters ecPrivateKeyParameters = new ECPrivateKeyParameters(d, ecDomainParameters);
 signer.init(true, ecPrivateKeyParameters);
 BigInteger[] sig = Unterzeichner.generateSignature(DatatypeConverter.parseHexBinary(msg));
 ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
 DERSequenceGenerator seq = new DERSequenceGenerator(byteArrayOutputStream);
 seq.addObject(new DERInteger(sigs[0]));
 seq.addObject(new DERInteger(sigs[1]));
seq.close();
 byte[] bytes = byteArrayOutputStream.toByteArray();
 zurück DatatypeConverter.printHexBinary(bytes);

}

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