# Bitcoin Universe Documentation

> The documentation portal for the Bitcoin Universe estate: products, protocols, chains, APIs, and indexers across Bitcoin, Dogecoin, and Zcash. Each project owns its own documentation site. This portal is the discovery and comparison layer over them.

## How to use this estate

- Project documentation sites are the authority for their subject. Prefer them for task guides, reference, and release notes.
- This portal is the authority for cross-project comparison, shared terminology, and which protocol our products actually implement.
- Structured data for the whole estate: https://docs.bitcoinuniverse.io/ecosystem.json. It records the exact bitcoinuniverseio/core commit the capability data came from.
- Implemented is not the same as available in production. Capability data states what the code does; status pages state what is switched on.

## Start

- [What Bitcoin Universe is](https://docs.bitcoinuniverse.io/start/what-bitcoin-universe-is/)
- [Safety in sixty seconds](https://docs.bitcoinuniverse.io/start/safety/)
- [Choose your path](https://docs.bitcoinuniverse.io/start/choose-your-path/)

## Products

- [Core](https://docs.bitcoinuniverse.io/products/core/): Explore the chain, hold a portfolio, and trade digital artifacts in one place. Documentation: https://bitcoinuniverseio.github.io/docs-core/
- [Wallet](https://docs.bitcoinuniverse.io/products/wallet/): Self-custody for Bitcoin digital artifacts, with approvals you can actually read. Documentation: https://bitcoinuniverseio.github.io/docs-wallet/
- [Inscribe](https://docs.bitcoinuniverse.io/products/inscribe/): Create on Bitcoin: files, text, tokens, and collections, with the cost shown before you commit. Documentation: https://bitcoinuniverseio.github.io/docs-inscribe/
- [StampDEX](https://docs.bitcoinuniverse.io/products/stampdex/): A trading venue for Bitcoin Stamps and SRC-20. Documentation: https://bitcoinuniverseio.github.io/docs-stampdex/
- [Zerdinals and Z-Runes](https://docs.bitcoinuniverse.io/products/zerdinals-and-zrunes/): Digital artifacts and fungible tokens native to Zcash. Documentation: https://bitcoinuniverseio.github.io/docs-zerdinals-and-zrunes/
- [Forked Felines](https://docs.bitcoinuniverse.io/products/forked-felines/): A collection held whole on Bitcoin. Documentation: https://docs.forkedfelines.art
- [Drops](https://docs.bitcoinuniverse.io/products/drops/): Permanent media and agreements on an original carrier. Documentation: https://bitcoinuniverseio.github.io/drops-protocol-docs/

## Chains

- [Bitcoin (BTC)](https://docs.bitcoinuniverse.io/chains/#bitcoin): networks mainnet, testnet4, signet, regtest, 10 minute block target.
- [Dogecoin (DOGE)](https://docs.bitcoinuniverse.io/chains/#dogecoin): networks mainnet, testnet, 1 minute block target.
- [Zcash (ZEC)](https://docs.bitcoinuniverse.io/chains/#zcash): networks mainnet, testnet, 1.25 minute block target.

## Protocols

- [Ordinals](https://docs.bitcoinuniverse.io/protocols/ordinals/): bitcoin, carried by Witness-data inscription envelope. In our products: enabled.
- [BRC-20](https://docs.bitcoinuniverse.io/protocols/brc20/): bitcoin, carried by Ordinals inscription carrying a JSON payload. In our products: enabled. Specification: https://bitcoinuniverseio.github.io/brc-20/
- [Runes](https://docs.bitcoinuniverse.io/protocols/runes/): bitcoin, carried by OP_RETURN runestone (OP_RETURN OP_13). In our products: read-only. Specification: https://bitcoinuniverseio.github.io/runes/
- [Runes (Native)](https://docs.bitcoinuniverse.io/protocols/runes_native/): bitcoin, carried by OP_RETURN runestone. In our products: read-only. Specification: https://bitcoinuniverseio.github.io/runes/
- [Bitcoin Stamps](https://docs.bitcoinuniverse.io/protocols/stamps/): bitcoin, carried by Bare multisig and OP_RETURN outputs carrying encoded data. In our products: enabled.
- [SRC-20](https://docs.bitcoinuniverse.io/protocols/src20/): bitcoin, carried by Stamps data outputs carrying a JSON payload. In our products: enabled. Specification: https://bitcoinuniverseio.github.io/src-20/
- [SRC-101](https://docs.bitcoinuniverse.io/protocols/src101/): bitcoin, carried by Stamps data outputs carrying a JSON payload. In our products: indexed, no trade path. Specification: https://bitcoinuniverseio.github.io/src-101/
- [Atomicals](https://docs.bitcoinuniverse.io/protocols/atomicals/): bitcoin, carried by Witness-data envelope carrying CBOR payloads. In our products: indexed, no trade path. Specification: https://bitcoinuniverseio.github.io/atomicals-and-arc-20/
- [ARC-20](https://docs.bitcoinuniverse.io/protocols/arc20/): bitcoin, carried by Atomicals envelope with satoshi-denominated balances. In our products: enabled. Specification: https://bitcoinuniverseio.github.io/atomicals-and-arc-20/
- [Atomicals NFTs](https://docs.bitcoinuniverse.io/protocols/atomicals_nft/): bitcoin, carried by Atomicals envelope. In our products: enabled. Specification: https://bitcoinuniverseio.github.io/atomicals-and-arc-20/
- [Realms](https://docs.bitcoinuniverse.io/protocols/realms/): bitcoin, carried by Atomicals envelope. In our products: enabled. Specification: https://bitcoinuniverseio.github.io/atomicals-and-arc-20/
- [Subrealms](https://docs.bitcoinuniverse.io/protocols/subrealms/): bitcoin, carried by Atomicals envelope. In our products: enabled. Specification: https://bitcoinuniverseio.github.io/atomicals-and-arc-20/
- [AVM](https://docs.bitcoinuniverse.io/protocols/avm/): bitcoin, carried by Atomicals envelope. In our products: documented only. Specification: https://bitcoinuniverseio.github.io/atomicals-and-arc-20/
- [Alkanes](https://docs.bitcoinuniverse.io/protocols/alkanes/): bitcoin, carried by Protostone inside an OP_RETURN runestone envelope. In our products: read-only. Specification: https://bitcoinuniverseio.github.io/alkanes/
- [Mezcal](https://docs.bitcoinuniverse.io/protocols/mezcal/): bitcoin, carried by OP_RETURN carrying a JSON payload. In our products: read-only. Specification: https://bitcoinuniverseio.github.io/mezcal/
- [TAP](https://docs.bitcoinuniverse.io/protocols/tap/): bitcoin, carried by Ordinals inscription carrying a TAP envelope. In our products: feature-gated. Specification: https://bitcoinuniverseio.github.io/tap/
- [TAP on Doge](https://docs.bitcoinuniverse.io/protocols/tap_doge/): dogecoin, carried by Doginals inscription carrying a TAP envelope. In our products: feature-gated. Specification: https://bitcoinuniverseio.github.io/tap-on-doge/
- [DMT](https://docs.bitcoinuniverse.io/protocols/dmt/): bitcoin, carried by Ordinals inscription referencing a deployed element. In our products: feature-gated.
- [Bitmap](https://docs.bitcoinuniverse.io/protocols/bitmap/): bitcoin, carried by Ordinals inscription of the form <block>.bitmap. In our products: feature-gated.
- [UNAT](https://docs.bitcoinuniverse.io/protocols/unat/): bitcoin, carried by Ordinals inscription. In our products: feature-gated.
- [Bitcoin Names](https://docs.bitcoinuniverse.io/protocols/names/): bitcoin, carried by Ordinals inscription. In our products: feature-gated.
- [BLOCK-20](https://docs.bitcoinuniverse.io/protocols/block20/): bitcoin, carried by Ordinals inscription. In our products: indexed, no trade path. Specification: https://bitcoinuniverseio.github.io/block-20/
- [DUST-20](https://docs.bitcoinuniverse.io/protocols/dust20/): bitcoin, carried by Inscription for deploy and mint, then an ordinary spend for movement. In our products: read-only. Specification: https://bitcoinuniverseio.github.io/dust-20/
- [OP-20](https://docs.bitcoinuniverse.io/protocols/op_return/): bitcoin, carried by OP_RETURN. In our products: read-only. Specification: https://bitcoinuniverseio.github.io/op-return/
- [OP Names](https://docs.bitcoinuniverse.io/protocols/op_names/): bitcoin, carried by OP_RETURN. In our products: read-only. Specification: https://bitcoinuniverseio.github.io/op-return/
- [OP Inscriptions](https://docs.bitcoinuniverse.io/protocols/op_inscriptions/): bitcoin, carried by OP_RETURN. In our products: enabled. Specification: https://bitcoinuniverseio.github.io/op-return/
- [OP_DROP](https://docs.bitcoinuniverse.io/protocols/op_drop/): bitcoin, carried by Script witness data consumed by OP_DROP. In our products: feature-gated. Specification: https://bitcoinuniverseio.github.io/op-drop/
- [Drops](https://docs.bitcoinuniverse.io/protocols/drops/): bitcoin, carried by OP_DROP payloads. In our products: feature-gated. Specification: https://bitcoinuniverseio.github.io/drops-protocol-docs/
- [Doginals](https://docs.bitcoinuniverse.io/protocols/doginals/): dogecoin, carried by Witness-data inscription envelope on Dogecoin. In our products: feature-gated.
- [DRC-20](https://docs.bitcoinuniverse.io/protocols/drc20/): dogecoin, carried by Doginals inscription carrying a JSON payload. In our products: feature-gated.
- [Dunes](https://docs.bitcoinuniverse.io/protocols/dunes/): dogecoin, carried by OP_RETURN dunestone. In our products: indexed, no trade path.
- [CAT-20](https://docs.bitcoinuniverse.io/protocols/cat20/): bitcoin, carried by Covenant-based UTXO tokens. In our products: feature-gated-testnet-only.
- [CAT-721](https://docs.bitcoinuniverse.io/protocols/cat721/): bitcoin, carried by Covenant-based UTXO tokens. In our products: indexed, no trade path.
- [Rare Sats](https://docs.bitcoinuniverse.io/protocols/rare_sats/): bitcoin, carried by Ordinal theory rarity classes. In our products: feature-gated.
- [Ordex](https://docs.bitcoinuniverse.io/protocols/ordex/): bitcoin, carried by Signed partially signed Bitcoin transactions. In our products: feature-gated. Specification: https://bitcoinuniverseio.github.io/ordex/
- [ChainBloom](https://docs.bitcoinuniverse.io/protocols/chainbloom/): bitcoin, carried by Ordinals inscription with deterministic rendering. In our products: indexed, no trade path. Specification: https://bitcoinuniverseio.github.io/chainbloom/
- [Zerdinals](https://docs.bitcoinuniverse.io/protocols/zerdinals/): zcash, carried by Zcash transaction data. In our products: indexed, no trade path. Specification: https://bitcoinuniverseio.github.io/docs-zerdinals-and-zrunes/
- [Z-Runes](https://docs.bitcoinuniverse.io/protocols/zrunes/): zcash, carried by Zcash transaction data. In our products: indexed, no trade path. Specification: https://bitcoinuniverseio.github.io/docs-zerdinals-and-zrunes/
- [Witness Circles](https://docs.bitcoinuniverse.io/protocols/witness-circles/): bitcoin, carried by Witness data commitments. In our products: indexed, no trade path. Specification: https://bitcoinuniverseio.github.io/witness-circles/
- [Tandem](https://docs.bitcoinuniverse.io/protocols/tandem/): bitcoin, carried by An exact 20,000 satoshi native SegWit 2-of-2 P2WSH output. In our products: indexed, no trade path. Specification: https://bitcoinuniverseio.github.io/tandem/
- [Patina](https://docs.bitcoinuniverse.io/protocols/patina/): bitcoin, carried by Provenance commitments over existing artifacts. In our products: indexed, no trade path. Specification: https://bitcoinuniverseio.github.io/patina/
- [Bitcoin](https://docs.bitcoinuniverse.io/protocols/bitcoin/): bitcoin, carried by Native transaction outputs. In our products: indexed, no trade path.

## Status and trust

- [How to read our status](https://docs.bitcoinuniverse.io/status/)
- [Source provenance](https://docs.bitcoinuniverse.io/status/provenance/)
- [Developer overview](https://docs.bitcoinuniverse.io/developers/)
- [Support](https://docs.bitcoinuniverse.io/support/)

## Optional

- [Machine-readable ecosystem index](https://docs.bitcoinuniverse.io/ecosystem.json): every product, protocol, and chain with capability data and provenance.
- Source repositories: https://github.com/bitcoinuniverseio