TYPE 0x0805 · GOVERNANCE FAMILY

RELATIVE_VALUE

Anti-siphon ratio enforcement. Ensures the output value maintains a minimum ratio relative to the input value. Uses integer ratio arithmetic with 128-bit overflow protection. No Tapscript equivalent.

Governance Non-Invertible

Ladder Diagram

Fields

Field	Data Type	Size	Side	Description
numerator	NUMERIC	1-4 B	Conditions	Ratio numerator (≥ 0). The minimum fraction of input that must appear in output.
denominator	NUMERIC	1-4 B	Conditions	Ratio denominator (> 0). Divides the numerator to form the ratio.

Wire Format Breakdown

0x0805 0 2 NUMERIC · numerator NUMERIC · denominator Conditions = 14 bytes

0x0805 0 0 Witness = 4 bytes

Total 20 bytes

Evaluation Logic

1.Read numerator and denominator from NUMERIC fields

2.Validate: numerator ≥ 0, denominator > 0. If invalid → ERROR

3.Compute lhs = output_amount × denominator

4.Compute rhs = input_amount × numerator

5.Overflow check: if 64-bit multiplication overflows, recompute using __int128

6.If lhs ≥ rhs → SATISFIED

7.Otherwise → UNSATISFIED

Worked Example

Ratio: 9/10 (90% minimum retention)

Input: 10,000 sats. Output: 9,000 sats.

lhs = 9,000 × 10 = 90,000

rhs = 10,000 × 9 = 90,000

90,000 ≥ 90,000 → SATISFIED

Same ratio, output: 8,999 sats.

lhs = 8,999 × 10 = 89,990

rhs = 10,000 × 9 = 90,000

89,990 < 90,000 → UNSATISFIED (1 sat short)

JSON Wire Format

{
  "type": "RELATIVE_VALUE",
  "fields": [
    { "type": "NUMERIC", "value": 9 },
    { "type": "NUMERIC", "value": 10 }
  ]
}

Common ratios: 9/10 (90%), 99/100 (99%), 1/1 (100% — no value loss allowed), 19/20 (95%).

Use Cases

Anti-Fee-Siphon

Prevents a compromised hot key from draining value through excessive fees. A 99/100 ratio caps fee extraction to 1% of the UTXO value per spend, regardless of fee rate.

Recursive Covenant Value Preservation

Combined with RECURSE_SAME, ensures each recursive spend preserves at least N% of value in the covenant output. Creates a decay curve that protects against value extraction over multiple hops.

Treasury Guard

DAO treasury UTXOs with 95/100 ensure no single spend can extract more than 5% of treasury value. Combined with EPOCH_GATE, creates rate-limited treasury disbursement.

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