bitcoin-l2-rgb
RGB protocol: client-side validated smart contracts on Bitcoin + Lightning. Schema-driven contracts, AluVM (RGB VM), rgb-lightning-node for LN integration. USDT-on-RGB rollout. USE WHEN: building RGB contracts, integrating RGB Lightning, comparing with TAP.
What this skill does
# RGB Protocol RGB is a system of **client-side validated** smart contracts on Bitcoin and Lightning. Maintained by **LNP/BP Standards Association** + **RGB Consortium**. Repos: - `github.com/RGB-WG` — main RGB working group. - `github.com/RGB-Tools/rgb-lightning-node` — LN integration. ## Concepts ### Client-side validation RGB contracts don't put state on Bitcoin's chain. Instead: - Contracts publish **schema** + **state transitions**. - Owners hold cryptographic proofs of their balances. - Bitcoin txs commit to RGB state via Taproot tweaks (anchor commits). - Verification: walk the proof chain back to issuance. ### Schemas RGB schemas define contract types: - **Fungible asset** (RGB20). - **Non-fungible token** (RGB21). - **Custom** (e.g., medical records, supply chain) via AluVM scripts. ### AluVM RGB's virtual machine for contract logic: - Stack-based. - Register-machine with strict resource limits. - Smart contract code runs **client-side** during validation. ## RGB Lightning Network (RLN) `rgb-lightning-node` (RLN node) is an RGB-enabled LN node: - Lightning channels can carry RGB assets. - Each commitment tx has an extra output anchoring the RGB state transition. - Asset transfers via standard Lightning HTLCs with RGB-asset metadata. ## Recent (2026) - **March 2026 update**: refactored payment logic, BOLT12 integration, resource-oriented architecture. - **Desktop client** for RGB Assets launched March 2026 (first product-ready RGB asset desktop app). ### Bitlight Labs Major contributor; runs testing infrastructure for RGB Lightning. ### USDT on RGB Tether announced (August 2025) intent to issue USDT natively on RGB-compatible Lightning. Rollout in progress. ## Compared to Taproot Assets | Aspect | RGB | Taproot Assets | |--------|-----|----------------| | Backing | LNP/BP Association | Lightning Labs | | Smart contracts | Yes (AluVM) | Limited | | LN integration | rgb-lightning-node | tapd + LND | | Schema | Multiple (RGB20, RGB21, custom) | Single asset model | | Maturity | Beta production (March 2026) | v0.7 production | | Wallets | Limited | Wider (LN Terminal, etc.) | ## Use cases - **Stablecoins** (USDT on RGB). - **Custom smart contracts** for regulated assets, NFTs, supply chain tokens. - **Programmable money** with privacy by default (validation is client-side; on-chain only sees Taproot commitments). ## Architecture ``` [User wallet] - Holds RGB state proofs locally. - Commits state to Bitcoin via Taproot anchor. [Counterparty wallet] - Receives state transition + proof. - Validates client-side back to genesis. ``` Privacy: chain analyst sees only Taproot outputs, not asset amounts or recipients. ## Implementations - **rgb-core** — Rust core libraries. - **rgb-cli** — command-line tooling. - **rgb-lightning-node** — modified LDK with RGB anchor support. - **rgb-lightning-sample** — example apps. ## Common bugs - Lost state proof = lost assets (unrecoverable, no on-chain history). - LN state desync between channel updates → RGB commitment mismatch. - AluVM contract bugs → logic errors hard to detect post-issuance. - Wallet incompatibilities (different RGB schema versions). ## Status (late 2025 / 2026) - Production RGB Lightning beta. - USDT-on-RGB rollout. - Wallet ecosystem expanding (RGB Tools, BitMask, others). ## See also - [taproot-assets/SKILL.md](../taproot-assets/SKILL.md) - [liquid/SKILL.md](../liquid/SKILL.md) - [../../lightning/ldk/SKILL.md](../../lightning/ldk/SKILL.md) - [../../protocol/taproot/SKILL.md](../../protocol/taproot/SKILL.md)
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