TYPE 0x0505 · ANCHOR FAMILY

ANCHOR_SEAL

Asset seal anchor. Verifies an asset identifier hash and a state transition hash. Used for RGB-style client-validated assets and single-use seal protocols.

Anchor Invertible

Ladder Diagram

Fields

Field	Data Type	Size	Side	Description
asset_id	HASH256	32 B	Conditions	Hash identifying the asset being sealed
state_transition	HASH256	32 B	Conditions	Hash of the state transition being committed

No witness fields required. Both hashes are committed in conditions, binding the asset and its state transition to this output.

Wire Format Breakdown

0x0505 0 2 HASH256 · 32B HASH256 · 32B Conditions = 72 bytes

0x0505 0 0 Witness = 4 bytes (empty block)

Total 76 bytes

Evaluation Logic

1.Extract all HASH256 fields

2.If fewer than 2 HASH256 fields → ERROR

3.First hash = asset_id, second hash = state_transition

4.Both hashes present → SATISFIED

Return Values

Condition	Result
Fewer than 2 HASH256 fields	ERROR
2 HASH256 fields present (asset_id + state_transition)	SATISFIED

JSON Wire Format

Conditions (asset seal with state transition)

{
  "type": "ANCHOR_SEAL",
  "inverted": false,
  "fields": [
    { "type": "HASH256", "hex": "d4e5f6a7...asset identifier...32 bytes" },
    { "type": "HASH256", "hex": "b8c9d0e1...state transition hash...32 bytes" }
  ]
}

Seals a specific state transition for the identified asset to this UTXO. The seal is consumed when the UTXO is spent.

Use Cases

RGB-style Client-validated Assets

Anchor client-side validated asset state transitions on-chain. The asset_id identifies the contract, and the state_transition hash commits to the off-chain state change. Validators verify the full state history client-side while only the seal appears on-chain.

Single-use Seals

Implement single-use seal protocols where each UTXO can only commit to one state transition per asset. Spending the UTXO consumes the seal, preventing double-commitment of the same asset state.

NFT State Anchoring

Anchor non-fungible token ownership transitions on-chain. The asset_id uniquely identifies the NFT, and the state_transition commits to the new ownership or metadata state, creating an auditable chain of custody.

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