ARC-20
Fungible tokens where one token is exactly one satoshi, so balances move as coloured sats and splitting follows output ordering rules.
- Chain
- Bitcoin
- Carrier
- Atomicals envelope with satoshi-denominated balances
- Ownership model
- hybrid
- Decimals
- asset-defined
- Operations
- deploy, mint, transfer
- Also written
- arc-20
Where it came from
Created outside Bitcoin Universe by Arthur (atomicals.xyz), 2023.
Tokens are satoshis. One token is one satoshi, so token supply is real bitcoin.
Where the specification lives
The specification and reference documentation for ARC-20 live in bitcoinuniverseio/atomicals-and-arc-20 and are published at https://bitcoinuniverseio.github.io/atomicals-and-arc-20/. That site is the authority. This page exists so you can find it and compare it with the rest of the estate.
Bitcoin Universe indexes or implements it in bitcoinuniverseio/index-atomicals.
Support in Bitcoin Universe products
Where it appears
- Core: view, view-collection, view-activity, list, update-listing, unlist, buy, make-offer, accept-offer, cancel-offer, settle, reconcile
- Wallet: view, send, receive
- Inscribe: deploy, mint, transfer
Implemented
viewin-app-executionview-collectionin-app-executionview-activityin-app-executionlistin-app-executionupdate-listingin-app-executionunlistin-app-executionbuyin-app-executionmake-offerin-app-executionaccept-offerin-app-executioncancel-offerin-app-executionsettlein-app-executionreconcilein-app-execution
Not implemented, and why
sell- ARC-20 has no executable offer workflow on this marketplace surface.
Operational behaviour
Indexing
State is read from Configured Atomicals ElectrumX/Atomicals proxy.
What must be true before any change is accepted: Listing and buyer-funding mutations fail closed on indexer transport, schema, identity, ticker, amount, or ownership mismatch.
Confirmation
Settlement requires at least one confirmation by default; operators may configure 1-100.
Settlement requires at least 1 confirmation.
Reorganisation
The ARC-20 journal retains signed listing proof and converges sold rows through authoritative outspend reconciliation.
Freshness
No node-tip/indexer-tip comparison or maximum observation age is enforced.
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.