Contracts - Bitcoin

Y relacionado con lo anterior: contratos Bitcoin (low trust protocols) Y adiós a notarios y registradores #bitcoin

The oracle accepts a measurement request. The request contains the user-provided expression, a copy of the output script, and a partially complete transaction provided by the user. Everything in this transaction is finished except for the scriptSig, which contains just one signature (the grandson's) - not enough to unlock the output. The oracle checks the user-provided expression hashes to the value in the provided output script. If it doesn't, it returns an error. The oracle evaluates the expression. If the result is not the destination address of the output, it returns an error. Otherwise the oracle signs the transaction and inserts the signature into the scriptSig. Note that when signing a Bitcoin transaction, the input script is set to the connected output script. The reason is that when OP_CHECKSIG runs, the script containing the opcode is put in the input being evalu...

Full article: https://en.bitcoin.it/wiki/Contracts