Que no es la forma de la blockchain obras. El blockchain _is_ el protocolo consensuado donde Bob y Charlie le pide a la red si la transacción está ok. El blockchain no es algo que se agrega a localmente cuando las transacciones son recibidos. Se agrega a nivel local cuando nuevos bloques son recibidos, y los nuevos bloques sólo puede ser creado por la realización de la prueba de trabajo. Bloques y transacciones también debe cumplir con el consenso de las reglas que el nodo siguiente. Las reglas también cuentan con doble pasar de protección. Sí, muy consciente. :) No tengo absolutamente ninguna idea. Es determinado por lo que el sitio construcciones de las transacciones, y si incluso tienen una interfaz de usuario para rbf. Tendrías que preguntar a alguien del sitio.

La única preocupación de la seguridad de P2PKH es que sólo se requiere tecla 1 para gastar monedas pagadas. P2SH sólo le permite ser aún más seguro por la facilidad de poner más condiciones sobre la redención de sus monedas, como la necesidad de más de 1 tecla para pasar.

Así que, digamos que yo soy una persona que quiere mantener a mis bitcoins realmente seguro, y la forma en que me quiero hacer lo que es por que requieren de 3 fuera de un conjunto de 5 claves para gastar mis monedas. Así, el scriptPubKey que me gustaría que todo el mundo a utilizar a la hora de enviar monedas para mí es:

OP_3 {pubkey1} {pubkey2} {pubkey3} {pubkey4} {pubkey5} OP_5 OP_CHECKMULTISIG

Pero cada clave pública es de 33 bytes y para esto hace que una secuencia de comandos que se ~170 bytes, que es un poco mucho para codificar en un código QR. Y definitivamente es demasiada información para un ser humano para el proceso.

Pero si yo uso P2SH, el scriptPubKey está a sólo 23 bytes y el remitente no tiene que preocuparse acerca de qué es exactamente la canjear condición voy a instalar en mi monedas. P2SH obras como esta. Me tome el script que quiero ser mi scriptPubKey y yo serializar (voy a usar {} para denotar la serialización):

redeemScript = {OP_3 {pubkey1} {pubkey2} {pubkey3} {pubkey4} {pubkey5} OP_5 OP_CHECKMULTISIG}
redeemScript_hash = hash160(sha256(redeemScript))

Y, a continuación, el scriptPubKey que el remitente utiliza realmente es:

OP_HASH160 {redeemScript_hash} OP_EQUAL

Que está a sólo 23 bytes en total. Lo bueno es que proporciona una capa de abstracción. La persona que me está enviando monedas no necesita saber cómo estoy guardando mis monedas segura. Todo lo que ven es un hash de un redeemScript, pero no saben cuáles son las condiciones que redeemScript en realidad pone en canje de las monedas.

Básicamente, P2SH en sí no es inherentemente más seguro, ya que el redimir a la secuencia de comandos puede ser cualquier cosa. Pero lo que hace es habilitar a las monedas de los receptores para comunicarse fácilmente cómo de la moneda-los remitentes deberán enviar monedas, mientras que la moneda-receptores de dictar las condiciones de cómo/cuando esas monedas puede ser gastado.

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