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The total number of transactions in this blockincluding the coinbase transaction. Varies raw transaction Every transaction in this blockone after another, in raw transaction format. Transactions must appear in the data stream in the same order their TXIDs appeared in the first row of the merkle tree.
See the merkle tree section for details. The first transaction in a block must be a coinbase transaction which should collect and spend any transaction fees paid by transactions included in this block.
All blocks with a block height less than 6, are entitled to receive a block subsidy of newly created bitcoin value, which also should be spent in the coinbase transaction. The block subsidy started at 50 bitcoins and is being halved everyblocks —approximately once every four years.
Together, the transaction fees and block subsidy are called the block reward. A coinbase transaction is invalid if it tries to spend more value than is available from the block reward.
Transactions The following subsections briefly document core transaction details. OpCodes The opcodes used in the pubkey scripts of standard transactions are: Various data pushing opcodes from 0x00 to 0x4e 1— See the link below this list for a description.
Otherwise, it pushes false onto the stack. If that item is zero false it terminates the script in failure.
Starting with the subsequent public keyit compares the second signature against each remaining public key until it finds an ECDSA match. The process is repeated until all signatures have been checked or not enough public keys remain to produce a successful result.
Because public keys are not checked again if they fail any signature comparison, signatures must be placed in the signature script using the same order as their corresponding public keys were placed in the pubkey script or redeem script.
A complete list of opcodes can be found on the Bitcoin Wiki Script Pagewith an authoritative list in the opcodetype enum of the Bitcoin Core script header file Signature script modification warning: Signature scripts are not signed, so anyone can modify them.
Placing non-data-pushing opcodes in the signature script currently makes a transaction non-standard, and future consensus rules may forbid such transactions altogether. Non-data-pushing opcodes are already forbidden in signature scripts when spending a P2SH pubkey script.word - Translation to Spanish, pronunciation, and forum discussions.
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