Fiamma
A Bitcoin bridge and ZK verification network based on BitVM2
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About Fiamma
Fiamma moves zero-knowledge proof verification onto Bitcoin. It uses BitVM2 for optimistic verification: a proof is submitted and passes if unchallenged, and a dispute is settled by bit-by-bit comparison in Bitcoin script, where a false claim can be slashed. The chain is built on Cosmos SDK, validators handle proof checks and bridge accounting, and security is reinforced by Bitcoin restaking through Babylon. The bridge represents BTC 1:1 as FIABTC, each deposit sits in its own UTXO, and withdrawals return native bitcoin.
On top sits FIRE, a mobile app that gathers BTC staking, borrowing and perpetual trading, with the bridge moving liquidity into EVM ecosystems and Cosmos chains. Its position is the verification and transfer layer for Bitcoin liquidity, and it differs from multisig or federated bridges in that a dispute can go back to Bitcoin for adjudication instead of resting on a signer set. Bridge capacity maps one-to-one to the UTXO behind each deposit, so a single compromised position does not touch the others, an isolation that separates it from pooled custody designs.
Fiamma, a Bitcoin ZK infrastructure company, closed a $4M seed round in December 2024 led by Lightspeed Faction and L2IV, marking the first full implementation of BitVM2 and the smallest ZK verifiers in Bitcoin script. In Q1 2025, after stress-testing the Alpha Testnet, Fiamma resolved verification costs, flow, and incentive issues, becoming the first production-ready BitVM2 infrastructure. In Q3 2025, Fiamma Bridge launched on mainnet, enabling non-custodial BTC bridging to over 20 chains, with audits by Oppenzeppline and Bitslab. In Q4 2025, the Fire App was released, integrating bridging, yield, lending, and trading in a non-custodial setup. These milestones transform Bitcoin from a passive asset into a programmable one, establishing a trust-minimized cross-chain and DeFi foundation with long-term significance.
On 6 August 2026 Fiamma's BitVM2 Bitcoin bridge went live on mainnet, letting holders move BTC to 11 chains including Ethereum, Arbitrum, Aptos, BNB Chain and Base and mint the 1:1 backed FiaBTC. A points programme followed on 8 August, with multipliers for minting, holding and depositing into DeFi. Covering 11 chains makes it closer to a cross-chain issuance layer, and FiaBTC circulation depends on DeFi composability on each chain rather than the bridge itself. The points programme scores minting and depositing separately, meant to keep capital inside the ecosystem rather than mint-and-exit.
The design places each user's Bitcoin in an isolated vault controlled jointly by the user and a bridge committee, with withdrawal disputes contestable on Bitcoin layer one, so a single honest challenger can preserve integrity. The testnet drew 239,000 users and 5.5 million transactions. Fiamma raised a $4.3 million seed led by Lightspeed Faction and L2IV, with strategic backing from Babylon, BoB and CoreDAO. BitVM2 puts the challenge mechanism on Bitcoin itself, at the cost of a withdrawal challenge window and lower capital efficiency than a custodial bridge. Seed funding went mainly to contract audits and multi-chain operations.
Future strategy and roadmap: build Fiamma One into a non-custodial Bitcoin yield super app, extend lending and payment use cases, and offer institutions customisable Bitcoin treasury strategies.
Yovela Luo — Co-founder & CEO; drives the Bitcoin ZK verification network and BitVM2 implementation.
Cyimon Chen — Co-founder & CTO; seven years in ZK research, led development of the Bitcoin script verifiers.