TYPE 0x0701 · COMPOUND FAMILY

TIMELOCKED_SIG

Signature verification combined with a relative timelock (CSV) in a single block. Collapses the common SIG + CSV two-block pattern, saving 8 bytes on wire.

Compound Non-Invertible

Ladder Diagram

Fields

Field	Data Type	Size	Side	Description
scheme	SCHEME	1 B	Conditions	Signature scheme identifier (0x01 = Schnorr, 0x02 = ECDSA). Routes to post-quantum verifier when PQ scheme set.
timelock	NUMERIC	1-4 B	Conditions	Relative timelock in blocks (BIP 68 sequence value)
pubkey	PUBKEY	32-33 B	Witness	Public key (x-only 32B or compressed 33B)
signature	SIGNATURE	64-65 B	Witness	Schnorr signature (64B) or with sighash byte (65B)

Public key folded into Merkle leaf via merkle_pub_key (PubkeyCountForBlock = 1). No key field in conditions.

Wire Format Breakdown

Conditions side (in scriptPubKey):

0x0701 0 3 SCHEME · 1B NUMERIC · 3B = 12 bytes

Witness side (in input witness):

0x0701 0 2 PUBKEY · 32B SIGNATURE · 64B = 104 bytes

Total (conditions + witness) 150 bytes

Compared to separate SIG + CSV blocks: 157 bytes → 149 bytes (saves 8B / 5.1%)

Evaluation Logic

1. Verify witness PUBKEY against Merkle leaf (merkle_pub_key). If mismatch → UNSATISFIED

2. Check for SCHEME field. If PQ scheme, route to post-quantum verifier.

3. Verify SIGNATURE against PUBKEY using Schnorr (64-65B) or ECDSA (8-72B). If invalid → UNSATISFIED

4. If SEQUENCE_LOCKTIME_DISABLE_FLAG is set in timelock → SATISFIED (no CSV check)

5. Verify CheckSequence(timelock). If fails → UNSATISFIED

6. Both checks passed → SATISFIED

Return Values

Condition	Result
Missing required fields	ERROR
Merkle leaf pubkey count mismatch	ERROR
Negative timelock value	ERROR
Signature size out of range	ERROR
Merkle leaf verification fails	UNSATISFIED
Signature verification fails	UNSATISFIED
CSV sequence check fails	UNSATISFIED
Signature valid AND timelock elapsed	SATISFIED

JSON Wire Format

Conditions (scriptPubKey)

{
  "type": "TIMELOCKED_SIG",
  "inverted": false,
  "fields": [
    { "type": "PUBKEY", "hex": "02abc1...33 bytes" },
    { "type": "SCHEME", "hex": "01" },
    { "type": "NUMERIC", "value": 144 }
  ]
}

Witness (input)

{
  "type": "TIMELOCKED_SIG",
  "inverted": false,
  "fields": [
    { "type": "PUBKEY", "hex": "02abc1...33 bytes" },
    { "type": "SIGNATURE", "hex": "30440...64 bytes" },
    { "type": "NUMERIC", "value": 144 }
  ]
}

Use Cases

Lightning Channel Force Close

The to_local output in a commitment transaction requires the broadcaster's signature after a CSV delay. TIMELOCKED_SIG encodes this in one block instead of two, reducing witness overhead across all commitment transactions.

Vault Recovery Path

Hot wallet spending with mandatory cooling-off period. The hot key can sign, but the transaction is only valid after N blocks have passed since the UTXO was confirmed.

Inheritance Planning

Beneficiary can claim funds after an extended CSV delay (e.g., 26,280 blocks / ~6 months), proving liveness-failure of the original owner.

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