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optional bytes script = 2; optional bytes merchant_data = 7; ...

When serializing extended keys, this scheme uses alternate version bytes. Extended public keys use <code>0x049d7cb2</code> to produce a "ypub" prefi Additional registered version bytes are listed in [[https://github.com/satoshilabs/slips/blob/master/slip-0132. ...

...one after the other. If the node has all transactions, instead of two null bytes (for the depth and index), it should send an empty payload which nodes shou The index is either one byte, two bytes or four bytes depending upon the depth. ...

# To prevent DoS attack, scripts are limited to 10,000 bytes and 201 op codes; ...e data push size limit in script, a P2SH script may not be bigger than 520 bytes. Also, P2SH still requires the redeemer to publish all unexecuted branches ...

First, this BIP redefines the version field on transactions. The first four bytes are defined as the version number, while the last four bytes are defined as the ...

Alerts can be as short as 10 bytes. Here is a complete alert (without network message headers) that has an inc ...nst mapAlerts. It was verified that, in an average computer, sending a 188-bytes correct alert continuously on a 64 Kbytes/sec link still rises the victim's ...

...and has limited flexibility. Additionally the resulting scriptPubKey is 6 bytes larger than the standard "pay to address" scriptPubKey in common use. However this requires 14 bytes of additional op codes. ...

* The protocol message header bytes are *dynamically generated* based on the block challenge, i.e. every signet ...enge, as a single script push operation. I.e. if the block challenge is 37 bytes, the message start would be sha256d(0x25 || challenge)[0..3]. ...

The Bitcoin Core protocol now accepts raw data transactions up to 40 bytes per output using the opcode '''OP_RETURN'''. ...

...d</code> is derived from the length of the total payload minus twelve (12) bytes for the <code>subcommand</code>. Implementations MUST NOT rely on this form ...- Main network magic bytes ...

...a SHAKE256 stream (from the SHA-3 standard). The input must be exactly 64 bytes long (from the BIP85 HMAC output). ...is an example of a function that requires orders of magnitude more than 64 bytes of random input. Further, it is not possible to precalculate the amount of ...

bytes txid = 1; bytes block_hash = 3; ...

// possible encoding for a positive integers (which means no null bytes at // Null bytes at the start of R are not allowed, unless R would ...

#* Hard coded constants, such as maximum data push size (520 bytes) or sigops limit could be reevaluated or removed ...de>scriptPubKey</code> of the coinbase transaction. It must be at least 38 bytes, with the first 6-byte of <code>0x6a24aa21a9ed</code>, that is: ...

...d have a combined size greater than the maximum script element size of 520 bytes. ...ement size of 5000 bytes, the effect of this expansion was limited to 5000 bytes. ...

 required bytes tx_hash = 1;  optional bytes pubkey = 2; ...

| 1 || sha256 || 11k cycles || 11+ bytes || 0, 4 or 8 bytes || Yes || Low || Active | 2 || cuckoo-cycle || ss 28: 150G cycles / ~48M RAM || 6+ bytes || 168 bytes || No || High || Active ...

...output indices from different transactions are often equivalent, while all bytes of the transaction hash are effectively random variables. ...tes of information (8 bytes) compared to a standard P2PKH scriptPubKey (25 bytes). [4] ...

## no more than 1000 bytes in size * [32 bytes of hash data] ...

** perhaps with some weight to inverse-btc days destroyed or utxo-bytes days destroyed. ...