RGB Protocol (v0.11.1) does precisely what you ask: fungible belongings on Bitcoin and Lightning with out utilizing a sidechain or trusting a federation. It has been dwell on Bitcoin mainnet since July 2025.
As a substitute of a separate chain, RGB makes use of client-side validation: asset knowledge is saved completely off-chain and exchanged instantly between the events concerned.
Solely a compact cryptographic dedication is anchored inside a Bitcoin transaction, by way of an OP_RETURN output (Opret) or an unspendable script leaf within the taproot taptree (Tapret). Bitcoin stays the settlement and anti-double-spending layer; no further belief is launched.
For asset sorts, RGB defines schemas, i.e. declarative contract templates. The principle ones for fungible tokens are:
- NIA (Non-Inflatable Asset) — fastened provide
- IFA (Inflatable Fungible Asset) — with secondary issuance as much as an outlined cap
Each concern belongings whose possession is tied to Bitcoin UTXOs by way of single-use seals, and each work natively over Lightning Community channels with none modifications to the Lightning protocol.
Full documentation: docs.rgb.information
Disclosure: I work for the RGB Protocol Affiliation (rgb.information), the group supporting RGB Protocol v0.11.1.
