Hiciste un completamente nuevo de la transacción? Porque si el cambio "OP_DROP` a `OP_2DROP` el hash de la canjear script será diferente y por lo tanto "OP_EQUAL" devuelve "FALSE" si reutilizar tu viejo `scriptPubKey` con la actualización de redimir a la secuencia de comandos. Cada nodo tiene típicamente varios compañeros. Las transacciones de ir alrededor de la red y después de la validación de uno, un nodo envía la transacción a sus compañeros que no reciben la transacción, excepto si ya ha enviado esta transacción con ellos en el pasado. Esto es necesario porque de lo contrario, una sola transacción bloquearía toda la red como se multiplicaría hasta que existían miles de millones de veces. Por lo tanto, si usted envía una segunda vez, es simplemente ignorado. Java o javascript? Yo también debería haber mencionado que PN no confía en las conexiones entrantes. De modo que sólo se cuenta invs visto desde la salida compañeros. De lo contrario, sería fácil engañar a los PN como el que usted describe.

Bitcoin fue y todavía puede ser explotado por una persona que no es parte de una minería de la piscina. De hecho, la red no sabemos realmente acerca de la minería de piscinas ni se preocupan por ellos. En el principio, el Bitcoin fue extraído por las personas que utilizan sus propias CPUs. Luego, a medida que más y más gente quería mina de Bitcoin, los mineros comenzaron a usar más y más rápido de hardware, moviéndose desde la Cpu a la Gpu, y luego a los FPGAs, y ahora a ASICs.

Por desgracia, el rápido crecimiento de la minería significaba que era más difícil para un individuo para ser capaz de encontrar un bloque. Así que la gente comenzó a aunar sus recursos. Un grupo de individuos que iba a la mina como un grupo y el bloque de la recompensa sería dividir entre sí. Ese grupo tendrían una mayor probabilidad de encontrar un bloque de sólo una persona de minería de datos por sí mismo, y mientras cada uno iba a ser pagado menos, que sería capaz de ganar Bitcoin de forma más consistente, ya que tienen una mayor hashrate de una sola persona. Y así minería de piscinas nacieron.

Así que no es que Bitcoin fue diseñado para ser extraído de la mina de piscinas, sino que la minería piscinas eran una evolución natural del incremento general de la hashrate de la red.

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