Bitcoin is no longer just a currency. Over the years, it has become a true technological foundation on which other financial applications can be built.
One of the most promising innovations in this regard is called the RGB protocolLittle known to the general public, it is attracting more and more attention because it allows the creation and transfer of digital assets — such as stablecoins, tokenized shares or even NFTs — directly on Bitcoin.
Recently, Tether's announcement to issue USDT via RGB probably marks a turning point. This proves that major players believe in this protocol and are betting on it for the future.
But how does it work? And above all, how can it be used in practice?
RGB, an extension of Bitcoin without modifying Bitcoin
RGB is a protocol designed to run “on top” of Bitcoin, without affecting the network’s consensus. It is based on a simple idea: to use Bitcoin as cryptographic settlement and anchor layer, while all asset-related information (ownership, transfers, etc.) is stored and verified off-chain, by the users themselves.
This is called the client-side validation (client-side validation). Rather than requiring the entire blockchain to validate each asset transfer, each user locally stores cryptographic proof of their holdings. Bitcoin only stores cryptographic commitments (hashes), which avoids network congestion.
In short: Bitcoin provides security, RGB provides flexibility.
RGB was designed to enable everything possible with blockchain-based smart contracts (like Ethereum and other systems), but in a more scalable, robust, and private way.
The advantages of the RGB protocol
RGB stands out in several key ways:
- Scalability : since the blockchain does not record everything, it is possible to manage millions of assets without congesting Bitcoin.
- Confidentiality : balances and transfers are not publicly visible on the channel, which increases discretion.
- Lightning Compatibility : RGB assets (like USDT) can circulate on the Lightning Network, allowing instant and inexpensive payments.
- Flexibility : we can issue all kinds of assets: stablecoins, bonds, tokenized shares, discount vouchers, digital certificates, etc.
RGB thus gives Bitcoin a dimension that we have not seen for a long time: that of an open platform for financial innovation.
RGB compatible wallets
Today, if you want to try the RGB protocol, there are already some concrete options—although be aware that full support is still under development.
- Among the first graphical interfaces to have integrated RGB, MyCitadel deserves a special mention. Developed in 2021 by the creators of RGB themselves, this wallet is available on desktop (Linux, macOS, Windows) and on iOS/iPad, and allows you to manage RGB fungible assets. Recently, the team has been working on a revised version to support version 0.11 of the RGB protocol, although it is not yet finalized
- Then, Iris, an Android wallet developed by the Bitfinex team, already offers support for both RGB fungible and non-fungible assets. It is one of the first mobile wallets to offer this compatibility
- For fans of web and NFT solutions, BitMask works like a MetaMask on Bitcoin. This extension/web wallet allows you to interact with RGB contracts, especially for NFTs, via a browser — an interesting bridge between the simplicity of a web wallet and the power of RGB.
- Bitlight Wallet, Designed by Bitlight Labs and a member of the LNP/BP association, it is a modern non-custodial wallet designed for DeFi on Bitcoin as well as for the integration of tokenized payments. It supports the RGB protocol and establishes itself as a robust technical alternative for advanced users.
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How to use RGB in practice?
Today, RGB remains a young protocol, but there are already practical ways to experiment with it.
- Install a compatible wallet
These wallets allow you to generate, store and transfer RGB assets. - Receive or emit an RGB asset
For example, a user can receive USDT issued via RGB (as Tether recently announced). When they receive the token, their wallet stores a cryptographic “proof.” - Send an RGB asset
When sending, the user transmits the proof to the recipient. The transaction is anchored to Bitcoin (via a hash in a standard transaction), but without the data overhead. - Payments via Lightning
RGB is designed to work with the Lightning Network. This means that you'll soon be able to send USDT or other RGB assets as easily and quickly as you send satoshis.
Current limitations and challenges
It's not all rosy. RGB is still under development, and some aspects need to mature:
- Technical complexity : Managing cryptographic evidence on the user side requires good integration into wallets. Without this, the risk of loss is real.
- Adoption still low : few exchanges and services accept RGB at the moment.
- interoperability : not all Lightning wallets and solutions are yet compatible.
- Ideological debate : some purists believe that Bitcoin should remain “simple” and not be used to tokenize assets.
Conclusion
RGB is still young, but it could well give Bitcoin a new lease of life. By providing a secure and scalable way to create and exchange digital assets, it paves the way for a future where Bitcoin is not only a store of value, but also the global monetary infrastructure.
Learning to use RGB today is a bit like setting up your first Bitcoin wallet in 2011: still technical, but with immense potential. Those who dive in now will likely be ahead of the rest of the world tomorrow.
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