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Merged
GitGab19 merged 1 commit into from
Jun 9, 2026
Merged

remove SHORT_TX_ID #197

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3 changes: 1 addition & 2 deletions 03-Protocol-Overview.md
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,6 @@ Multibyte data types are always serialized as little-endian.
| MAC | 16 | Message Authentication Code produced with AE algorithm |
| PUBKEY | 32 | X coordinate of Secp256k1 public key (see BIP 340) |
| SIGNATURE | 64 | Schnorr signature on Secp256k1 (see BIP 340) |
| SHORT_TX_ID | 6 | SipHash-2-4(TX_ID, k0, k1) where two most significant bytes are dropped from the SipHash output to make it 6 bytes. TX_ID is 32 byte transaction id and k0 and k1 are U64 siphash keys. |
| OPTION[T] | 1 + (occupied ? size(T) : 0) | Alias for SEQ0_1[T]. Identical representation to SEQ0_255 but enforces the maximum size of 1 |
| SEQ0_255[T] | Fixed size T: `1 + LENGTH * size(T) Variable length T: 1 + seq.map(\|x\| x.length).sum()` | 1-byte length L, unsigned integer 8-bits, followed by a sequence of L elements of type T. Allowed range of length is 0 to 255. |
| SEQ0_64K[T] | Fixed size T: `2 + LENGTH * size(T)Variable length T: 2 + seq.map(\|x\| x.length).sum()` | 2-byte length L, unsigned little-endian integer 16-bits, followed by a sequence of L elements of type T. Allowed range of length is 0 to 65535. |
Expand Down Expand Up @@ -371,4 +370,4 @@ That's because the Template Distribution Server would not be able to propagate a
On the Template Distribution Protocol's `NewTemplate` there is one field affected by BIP141:
- `coinbase_tx_outputs`

In case of blocks containing SegWit transactions (and optionally blocks that don't as well), this field carries the `OP_RETURN` output with the witness commitment. The `witness reserved value` (Coinbase witness) used for calculating this witness commitment is assumed to be 32 bytes of `0x00`, as it currently holds no consensus-critical meaning. This [may change in future soft-forks](https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#extensible-commitment-structure).
In case of blocks containing SegWit transactions (and optionally blocks that don't as well), this field carries the `OP_RETURN` output with the witness commitment. The `witness reserved value` (Coinbase witness) used for calculating this witness commitment is assumed to be 32 bytes of `0x00`, as it currently holds no consensus-critical meaning. This [may change in future soft-forks](https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#extensible-commitment-structure).
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