Eine Frage wie diese könnten eine bessere Reaktion auf ein Mathe-oder Allgemeine Kryptographie StackExchange. Es gibt nichts in der Frage spezifisch für bitcoin (außer Sie passieren zu wollen, ein kryptographisch guter Zufallszahlen für den Einsatz in bitcoin). Ich dachte, es war eine 2mb block Gewicht? Gibt es andere proof-of-work-Verfahren vielmehr als nur die Berechnung eines Hashwertes für eine Billion mal? Ja, irgendwie schon, aber Sie sollten Ihren Standpunkt zu ändern. Was ist "Einsatz" ist die Ausgabe, nicht die Transaktion. Sie können sehen, eine Transaktion wie eine Sammlung von mehreren ein-und Ausgängen. Jede Eingabe ist ein Bezug zu einer vorherigen Transaktion und eine spezifische Leistung, die ausgegeben werden, und jede Ausgabe, die kodiert seine eigenen Bedingungen einlösen. Normalerweise, in den meisten Bitcoin-Transaktionen (P2PKH), die Bedingungen bedeuten, daß der Erlöser ist, müssen beweisen, dass das Eigentum an der Ziel-Bitcoin-Adresse, das geschieht durch erstellen einer digitalen Signatur.

plus weitere 5 Bestätigung Blöcke

Jeder block enthält den Hashwert des vorherigen Blocks, so Mallory nicht entfernen können, einer der Blöcke hinter diesen und legte seine ohne ungültig, Sie.

Aber als Mallory sendet Ihr Blöcke mit delay, Alice denken "Blöcke kommen mit Verzögerungen von mehr als 10 Minuten. Die Schwierigkeit verringern." Mallory wird in der Lage sein zu erstellen, die mehr Blöcke nach M Blöcke mit niedriger Schwierigkeit. Dennoch, für diese Methode zu arbeiten, N muss sehr groß sein oder C muss etwas großes.

Der wichtigste Punkt hier ist

Bergleute müssen angeschlossen werden, um Hunderte von Knoten, in der Lage sein, um erhalten Sie die neusten block so schnell wie Sie können. Sie können nicht MitM alle von Ihnen.

Weniger wichtig ist

Auch wenn Sie MitM die verbindungen zwischen Alice und alle Knoten, Bergleute verwenden Sie irgendeine Art von software zu stehlen, hashes und andere block-Header von anderen pools. Sie würde sehen, dass diese pools " - block Höhen höher sein wird, als Alice und Alice wird es bemerken.

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