Fedimint: A Decentralized and Confidential Bitcoin Protocol
Many Bitcoin holders, despite the obvious risks, still use custodial wallets and centralized exchanges. Fedi, a startup, offers an innovative approach to transitioning to a more secure and reliable coin storage solution.
Fedi is an innovative Bitcoin startup that is developing the open-source Fedimint protocol integrated with the Lightning Network. Fedimint aims to provide independent coin storage, reducing the entry barrier for self-custody and facilitating the transition from exchanges to individual Bitcoin network operations. The protocol’s creators aim to simplify access to BTC operations, minimize risks for individuals from third-party influences, and avoid fractional reserve banking. The protocol strives to offer these capabilities to billions of users, particularly those with limited resources, which is especially relevant for the Global South.
The protocol is designed to distribute trust among multiple parties. It utilizes consensus algorithms and threshold cryptography to ensure security and availability, even when some participants are compromised. In simpler terms, if participants are sufficiently decentralized, not even a nation-state-level attacker can harm the federation of participants since the ownership distribution of bitcoins is maximally decentralized. Furthermore, in addition to being able to run Fedimint anonymously, its advantage lies in the absence of any participant or group that could seize the funds of others.
So, how does Fedimint work? When users send Bitcoins to these federated mints, they receive Ecash tokens representing different denominations of satoshis. They can then confidentially send these tokens within the mint to other users. When users are within the federation and transacting with Ecash tokens, other federation members do not know who is transferring funds to whom.
Fedimint provides customers with the option to use custodial wallets, but thanks to the federation of trusted Fedi custodians, participants receive significant protection against attackers who may seize or irresponsibly handle the funds in custody. This storage model does not rely solely on trust.
The protocol utilizes blind signatures for the issuance and redemption of electronic funds. This means that the mint can track the total amount of bitcoins deposited in the mint, as well as the total amount of issued and unredeemed Ecash. However, the mint is unaware of a user’s account balance, who received Ecash, who redeemed it, or any transaction history during the period between issuance and redemption. Fedi also improves Bitcoin scalability since economic activity can be offloaded from the limited-capacity base-level blockchain.
Ecash can be spent within the mint with any other user or through integration with the Lightning Network – anywhere beyond the mint, via a Lightning Network channel. Thus, a coin owner can initiate a payment from within the mint that is instantly converted into a Lightning payment. Users from one mint can also transact with users from another mint, utilizing the Lightning Network as the primary payment network.
The shared storage and spending of funds in Fedi make it a reliable way to scale Bitcoin, as every village, church, district, or online community can create a mint for its members, satisfying the economic interests of all participants. When they need to make a payment to someone outside the community’s mint, they can use a Lightning channel to pay anywhere and to anyone who accepts Lightning Network payments or even make a payment to a participant from another mint.
Advantages and Opportunities of Fedimint
In May 2023, the startup Fedi raised $17 million in investments. So, what makes it so popular and promising? Fedimint expands the possibilities for those who want to engage with Bitcoin without the need to make protocol-level changes. Bitcoin is inherently conservative at its base layer, designed to scale at higher levels. Currently, the main options include Lightning Network for micro-payments and Liquid Network for third-party assets, tokenization, and arbitrage trading. In the future, Bitcoin will have more layers, and Fedimint aims to be part of this ecosystem by adding much-needed privacy tools for BTC users worldwide, especially those living under repressive regimes.
Fedimint is a middle ground between custodial storage (such as exchanges) and non-custodial storage (e.g., in a cold wallet). This option is sometimes referred to as “second-party custody.” Instead of trusting unknown intermediaries, you trust friends, family, or community leaders. In this case, the custodians are the most technologically experienced members of the community who use Fedimint servers and provide reliable services to everyone else.
As for recovery options, Fedimint users can create a backup of their assets using a seed phrase, just like traditional Bitcoin wallets (i.e., 12 or 24 words).
Conclusion
Fedimint enables a quick transition to the Bitcoin standard for users who lack a significant technical background and experience with hardware wallets. Thus, people can adopt Bitcoin and Lightning Network on a community-wide scale without relying on centralized intermediaries. However, in most cases, Fedimint will serve as an initial step towards utilizing more decentralized and secure non-custodial solutions. In any case, Fedimint represents a significant advancement in the development of Bitcoin payment infrastructure and the onboarding of new Bitcoiners from around the world.