Problema del cumpleaños de 160 bits de direcciones bitcoin no se aplica, ya que los accidentes son irrelevantes. Es una segunda pre-imagen ataque que ha costado (2^160)/n donde n es el número de objetivos. Así que si todos los 21 millones de bitcoins ya están minadas, es necesario calcular (2^160)/(21*10^6) = 7*10^40 = 2^135 hashes por robo de bitcoin. Que no es rentable (por ahora), incluso si se supone bitcoin se utiliza para todos los de nuestra economía. Como Janes dijo, sus supuestos son correctos. El minero que resuelve el bloque (o su grupo) inserta un especial de "coinbase" de transacciones en el bloque que afirma que el bloque de la recompensa y los honorarios de transacción. Todos las pruebas de su validez de acuerdo a las reglas, de la misma manera que la prueba de la validez de todas las transacciones. Las reglas incluyen permitir a un bloque de recompensa de acuerdo a una programación.

Es, de alguna forma, pero algunas consideraciones a tener en cuenta.

Hay dos maneras de crear un multisig transacción: Pago por multisig, o un Pay-to-script-hash encapsular un Pay-to-multisig. Por cómo se están haciendo la pregunta supongo que te refieres a la última. Sin embargo, voy a darles respuestas por si acaso.

Pagar-para-script-hash (P2SH)

Las secuencias de comandos de un 2-3 multisig encapsulado en un P2SH transacción se parece a:

ScriptSig: OP_0 [Sig 1] [Sig 2] OP_2 [PK 1][PK 2][PK 3] OP_3 OP_CHECKMULTISIG

ScriptPubKey: OP_HASH160 <ScriptHash> OP_EQUAL

Como usted ha mencionado, Bob va a ser capaz de recrear la secuencia de comandos desde el ScriptPubKey sólo se requiere el hash de la que genera scriptSig, y él tiene toda la información. Sin embargo, el orden importa. En este caso (2-3 multisig) Alice podría haber generar la secuencia de comandos de seis maneras diferentes:

  • ScriptSig: ... OP_2 [PK 1][PK 2][PK 3] OP_3 OP_CHECKMULTISIG
  • ScriptSig: ... OP_2 [PK 1][PK 3][PK 2] OP_3 OP_CHECKMULTISIG
  • ScriptSig: ... OP_2 [PK 2][PK 1][PK 3] OP_3 OP_CHECKMULTISIG
  • ScriptSig: ... OP_2 [PK 2][PK 3][PK 1] OP_3 OP_CHECKMULTISIG
  • ScriptSig: ... OP_2 [PK 3][PK 1][PK 2] OP_3 OP_CHECKMULTISIG
  • ScriptSig: ... OP_2 [PK 3][PK 2][PK 1] OP_3 OP_CHECKMULTISIG

Esto tiene dos consecuencias, la más sencilla es que si el guión no es construir de la misma manera, el hash será diferente. Por otra parte, el orden en el que las claves son siempre indica cómo las firmas deben ser proporcionados, es decir, firmas y claves tienen que estar siempre en el mismo orden.

e.g:

ScriptSig: OP_0 [Sig 2] [Sig 1] OP_2 [PK 2][PK 3][PK 1] OP_3 OP_CHECKMULTISIG

Luego, en un n-m multisig, Alice tendrá n! formas de organización de las claves Públicas. Si no previstos en el orden correcto, la evaluación de la secuencia de comandos se producirá, de hacer la transacción no válida.

Pagar-para-multisig

En el caso de Pagar-a-multisig, la solución es mucho más sencilla debido a la información que cada secuencia de comandos de tiendas. El uso de la misma 2-3 multisig ejemplo, la resultante de los guiones serán:

ScriptSig: OP_0 [Sig 1] [Sig 2]

ScriptPubKey: OP_2 [PK 1][PK 2][PK 3] OP_3 OP_CHECKMULTISIG 

En este caso, no sólo la última, pero todas las partes implicadas se sabe cómo construir el ScriptSig, desde cómo la ScripPubKey fue construir es accesible desde la transacción anterior.

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