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You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. If any opcode marked as disabled is present in a script - it must also abort and fail. These words are used internally for assisting with transaction matching. They are invalid if used in actual scripts. Any opcode not assigned is also reserved. Using an unassigned opcode makes the transaction invalid.
The following is a list of interesting scripts. When notating scripts, data to be pushed to the stack is generally enclosed in angle brackets and data push commands are omitted. Non-bracketed words are opcodes. Note that there is a small number of standard script forms that are relayed from node to node; non-standard scripts are accepted if they are in a block, but nodes will not relay them.
Note: scriptSig is in the input of the spending transaction and scriptPubKey is in the output of the previously unspent i. This was used by early versions of Bitcoin where people paid directly to IP addresses, before Bitcoin addresses were introduced. The disadvantage of this transaction form is that the whole public key needs to be known in advance, implying longer payment addresses, and that it provides less protection in the event of a break in the ECDSA signature algorithm.
The standard way to mark a transaction as provably unspendable is with a scriptPubKey of the following form:. Thus the output can be immediately pruned from the UTXO set even if it has not been spent. Transaction a4bfa8abae5f25dae9d89e4eb67dfacafc1ddc5abbc31b is an interesting puzzle. To spend the transaction you need to come up with some data such that hashing the data twice results in the given hash. This transaction was successfully spent by 09fbe71fd1db51ffda40cc0e4f8c8c2c4ab1.
The required data happened to be the Genesis block , and the given hash in the script was the genesis block header hashed twice with SHA Note that while transactions like this are fun, they are not secure, because they do not contain any signatures and thus any transaction attempting to spend them can be replaced with a different transaction sending the funds somewhere else.
In Peter Todd created scripts that result in true if a hash collision is found. Bitcoin addresses resulting from these scripts can have money sent to them. If someone finds a hash collision they can spend the bitcoins on that address, so this setup acts as an incentive for somebody to do so.
See the bitcointalk thread  and reddit thread  for more details. Jump to: navigation , search. The script for a typical Bitcoin transfer to destination Bitcoin address D simply encumbers future spending of the bitcoins with two things: the spender must provide a public key that, when hashed, yields destination address D embedded in the script, and a signature to prove ownership of the private key corresponding to the public key just provided.
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If the top stack value is not False, the statements are executed. The top stack value is removed. All blocks must end, or the transaction is invalid.
Marks transaction as invalid if top stack value is not true. Marks transaction as invalid.
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