We’re setting Bitcoin free.
Fiamma returns the freedom to use BTC to the people—upholding Satoshi’s vision of a trustless financial system.
By unlocking non-custodial, trust-minimized BTC access across chains, Fiamma empowers holders to seamlessly tap into optimized yield, credit, and real-world utility across DeFi, RWAs, and beyond.
Backed by
Led by Lightspeed Faction, we create lasting impact through innovation.
Fiamma Bridge
The 1st trust-minimized Bitcoin bridge, powered by BitVM2.
Mint FiaBTC to earn, trade, and borrow without giving up control.
$BTC
=
$FIABTC
11 chains supported on Day1
User Friendly Interface
The most trust-minimized bridging experience, Â with zero sacrifice in user experience.
Total Users
Total Transaction Value (FIABTC)
Total Transaction Count
The data is from Fiamma Bridge Beta Testnet. View more details on our bridge explorer:Â https://scan.fiammalabs.io/
How Fiamma Ensures Security
Non-custodial Bridging with BitVM2
Unlike other Bitcoin bridges that rely on centralized custodians or guardian networks, we enable Bitcoin itself to verify zero-knowledge proofs optimistically, making it the ultimate authority for bridging. This breakthrough unlocks Bitcoin programmability.
FiaBTC is 1:1 pegged to native BTC, secured by Bitcoin through zero-knowledge challenges, Taproot logic, and onchain fraud-proof resolution — allowing permissionless minting and redemption.
Isolated Safe Architecture™
Under Isolated Safe Architecture™, each user’s funds are secured in their own personal vault, jointly controlled by the user and the bridge committee—so even if the entire committee is compromised, your BTC remains safe, and stealing all assets would require breaching every user and every committee key, which is practically impossible.
Maximium Trust-minimization
We develop the smallest ZK verifiers in Bitcoin Script. With challenge transactions under 400KB, we eliminate reliance on specific mining pools for execution. We also enable permissionless challenge design to effectively reduce the 1-of-n trust assumption to near zero.
Battle-tested
Over 300,000 users have tested the Fiamma Bridge, powering over 6 million transactions across Ethereum, Solana, Monad, Bob, Plume, BNB chain and more. With growing volume flowing in, we're continuously optimizing for a smoother user experience.
“Trustless bridging infrastructure is needed to maximize the utility and functionality of Bitcoin. Fiamma’s implementation of BitVM2 via its Bitcoin-secured ZK proof verification network paves the way for trustless bridging, scalability and Bitcoin-native applications. We are excited to support the Fiamma team as they strive to refine new opportunities for the Bitcoin ecosystem.”
- Clara Boh
"The introduction of BitVM2 is particularly transformative — it pushes the boundaries of Bitcoin’s scripting capabilities, allowing for more expressive and flexible execution of decentralized applications."
- Kevin Lee & Weikeng Chen
"Built with BitVM and ZK tech, this integration opens up a secure path for BTC holders to access reward opportunities behind Bitcoin security. This represents a meaningful step towards a more interoperable future."
"Fiamma has been leading the charge on BitVM2 development from the very start. BOB has been a pioneer in BitVM, co-authoring the BitVM2 paper. Together, we’re accelerating BitVM to production—bringing trust-minimized bridging to Bitcoin DeFi and solving one of its longest-standing challenges."
