CAT-20

Fungible tokens enforced by covenant constructions rather than by indexer convention.

Chain

Bitcoin

Carrier

Covenant-based UTXO tokens

Ownership model

utxo

Operations

deploy, mint, transfer

Also written

cat, cat-20

Where it came from

Created outside Bitcoin Universe by The CAT protocol community, 2024.

Where the specification lives

CAT-20 has no Bitcoin Universe specification repository. Its specification is Maintained upstream.

Bitcoin Universe indexes or implements it in bitcoinuniverseio/index-cat20.

Support in Bitcoin Universe products

Feature gated, testnet only

Implemented for testnet behind a gate. Not available on mainnet.

Execution model: Preview only; no executable trade. This surface sits behind the cat20FractalTrade feature gate.

Where it appears

• Core: view, view-collection, view-activity
• Wallet: view, send, receive
• Inscribe: mint

Implemented

• viewtrade-preview-only
• view-collectiontrade-preview-only
• view-activitytrade-preview-only

Not implemented, and why

list

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

update-listing

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

unlist

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

buy

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

make-offer

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

accept-offer

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

cancel-offer

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

sell

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

settle

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

reconcile

Fractal testnet reads and trade preview are available, but no CAT20 signer or broadcaster exists.

Operational behaviour

Indexing

State is read from Configured CAT20 tracker plus Fractal Bitcoin Core read client.

What must be true before any change is accepted: Mainnet is unavailable; preview does not authorize execution.

Confirmation

No executable settlement exists.

Reorganisation

Read state follows tracker/node responses; no local order lifecycle exists.

Freshness

Trade preview enforces the runtime-configured order-book age (120 seconds by default) and future-skew limit, but no chain-tip lag ceiling.

Provenance

Capability facts on this page were generated from backend/packages/ecosystem-contracts/lib/protocols.js in bitcoinuniverseio/core at 15dd03b5986a. Implemented behaviour is not the same as production availability: see how to read our status.