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All bitcoin transactions have scripts embedded into its inputs and outputs. The scripts use a very simple programming language, which is evaluated from left to right using a stack. The language is designed such that it guarantees all scripts will execute in a limited amount of time it is not Turing-Complete. When a transaction is validated, the input scripts are concatenated with the output scripts and evaluated. To be valid, all transaction scripts must evaluate to true. A good analogy for how this works is that the output scripts are puzzles that specify in which conditions can those bitcoins be spent.
The input scripts provide the correct data to make those output scripts evaluate to true. For more detailed information about the bitcoin scripting language, check the online reference on bitcoin's wiki. The Script object provides an interface to construct, parse, and identify bitcoin scripts.
It also gives simple interfaces to create most common script types. This class is useful if you want to create custom input or output scripts. In other case, you should probably use Transaction. This is the most commonly used transaction output script. It's used to pay to a bitcoin address a bitcoin address is a public key hash encoded in base58check. Pay to public key scripts are a simplified form of the p2pkh, but aren't commonly used in new transactions anymore, because p2pkh scripts are more secure the public key is not revealed until the output is spent.
Multisig outputs allow to share control of bitcoins between several keys. When creating the script, one specifies the public keys that control the funds, and how many of those keys are required to sign off spending transactions to be valid.
An output with N public keys of which M are required is called an m-of-n output For example, 2-of-3, 3-of-5, 4-of-4, etc. Note that regular multisig outputs are rarely used nowadays. Pay to script hash outputs are scripts that contain the hash of another script, called redeemScript. 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.
This allows to defer revealing the spending conditions to the moment of spending. It also makes it possible for the receiver to set the conditions to spend those bitcoins. Most multisig transactions today use p2sh outputs where the redeemScript is a multisig output. Data outputs are used to push data into the blockchain.
Up to 40 bytes can be pushed in a standard way, but more data can be used, if a miner decides to accept the transaction.
To create a custom Script instance, you must rely on the lower-level methods add and prepend. Both methods accept the same parameter types, and insert an opcode or data at the beginning prepend or end add of the Script. Script has an easy interface to parse raw scripts from the network or bitcoind, and to extract useful information. An illustrative example for more options check the API reference. To validate a transaction, the bitcoin network validates all of its inputs and outputs.
To validate an input, the input's script is concatenated with the referenced output script, and the result is executed. If at the end of execution the stack contains a 'true' value, then the transaction is valid. You can do this in bitcore by using the Interpreter class.
The entry point and probably the only interface you'll need for most applications is the method Interpreter verify. Note that verify expects two scripts: This is because different conditions are checked for each. Bitcoin transactions contain scripts. Each input has a script called the scriptSig, and each output has a script called the scriptPubkey.
If at the end of execution the stack contains a "true" value, then the transaction is valid. Verifies a Script by executing it and returns true if it is valid. This function needs to be provided with the scriptSig and the scriptPubkey separately. Based on bitcoind's EvalScript function, with the inner loop moved to Interpreter. Checks a locktime parameter with the transaction's locktime.
There are two times of nLockTime: See the corresponding code on bitcoin core: Based on the inner loop of bitcoind's EvalScript function bitcoind commit: A bitcoin transaction script. Each transaction's inputs and outputs has a script that is evaluated to validate it's spending.
Retrieve the associated data for this script. In the case of a pay to public key hash or P2SH, return the hash. Script - this script instance. Script - a new pay to script hash script that pays to this script. Address boolean - the associated address for this script if possible, or false. Analogous to bitcoind's FindAndDelete. Find and delete equivalent chunks, typically used with push data chunks. Note that this will find and delete not just the same data, but the same data with the same push data op as produced by default.
Script - a new Multisig output script for given public keys, requiring m of those public keys to spend. A new P2SH Multisig input script for the given public keys, requiring m of those public keys to spend.
Script - a new pay to public key hash output for the given address or public key. Script - a new pay to public key output for the given public key. Script - new pay to script hash script for given script. Script - an empty script. Script - an output script built from the address.