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A simple, stack-based, Forth-like programming language using "opcodes" to express spending conditions.

Script is used to define how funds may be spent. A script consists of two parts. In a transaction output funds are assigned to a locking script, the scriptPubKey. The corresponding transaction input provides a method for initializing a stack as input to the scriptPubKey, the scriptSig. In segwit output types, the witness encodes the stack directly. The set of commands in Script are referred to as "opcodes".

There are a number of standard scripts and scripts which are defined by an address. These include Pay-to-Public-Key-Hash, Pay-to-Script-Hash, Pay-to-Witness-Public-key-hash, and Pay-to-Witness-Script-Hash.

This tag should be used for questions regarding scripts and opcodes used in transactions.