an easy interface to parse raw scripts from the network. Two notable example scripts used within the Bitcoin protocol are scriptPubKey and scriptSig. OP_n OP_checkmultisig P2SH addresses were created with the motivation of moving "the responsibility for supplying the conditions to redeem a transaction from the sender of the funds to the redeemer. To spend bitcoins sent in a p2sh output, the spending transaction must provide a script matching the script hash and data which makes the script evaluate to true. More precisely, the second component is an ecdsa signature over a hash of a simplified version of the transaction. When the recipient wants to spend this money, he will reference output #0 of this transaction in an input of his own transaction. There are conditional operators which give the result true or false which in the case of validating a transaction are true if the signature is valid. More information on Script can be found here: A complete list of all opcodes used within Bitcoin Bitcoin Developer Reference. The Scriptpubkey is the puzzle set to a transaction in order for it to be solved and the script sig is the solution to the puzzle that allows it to be spent. The stack based execution language has a few important benefits such as its simplicity and minimal processing.
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Principle example of a, bitcoin transaction with 1 input and 1 output only. A bitcoin transaction is just a bunch of data that describes the movement of bitcoins. They allow the sender to fund an arbitrary transaction, no matter how complicated, using a 20-byte hash". Most multisig transactions today use p2sh outputs where the redeemScript is a multisig output. The Script programming language. The scripts use a very simple programming language, which is evaluated from left to right using a stack. sig pubKey pubHashA pubKeyHash OP_equalverify OP_checksig Top stack item is hashed. 0 sig1 sig2 OP_2 pubKey1 pubKey2 pubKey3 OP_3 OP_checkmultisig Only the scriptSig is used. When a transaction is validated, the input scripts are concatenated with the output scripts and evaluated. A detailed explanation of a hash function can be found here: What is SHA-256 and How is it Related to Bitcoin? The language is designed such that it guarantees all scripts will execute in a limited amount of time (it is not Turing-Complete).
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