Cross Chain Bridge · Review
ActiveFiamma Review 2026: BitVM2 Bitcoin Bridge
Fiamma is a Bitcoin bridge designed to issue 1:1 wrapped BTC using BitVM2 and zero-knowledge proofs verified on Bitcoin. Its design aims to reduce trust assumptions, but details about supported networks, fees, and audits are limited.
By the DappsAtlas editorial team · Updated
DappsAtlas score
5.5/10
Mixed
Our verdict on Fiamma
5.5/10Fiamma may suit Bitcoin holders who want to use a wrapped form of BTC in other blockchain ecosystems and are comfortable with bridge risk. Its central strength is a design based on BitVM2 and zero-knowledge proofs verified on Bitcoin, rather than relying only on a conventional bridge model. The main caveat is the lack of detail on supported networks, fees, redemption terms, and the two listed audits. Compare those details against your needs before moving BTC.
Score breakdown
How Fiamma scores
- Security
- 5.0/10
- Ease of use
- 5.0/10
- Fees
- n/a
- Features
- 6.0/10
Scores run from 0 to 10 and are based only on facts we could verify. Where information was missing we mark the score n/a rather than guess.
What is Fiamma?
Fiamma is a Bitcoin-focused bridge project that aims to make BTC usable across blockchain ecosystems through a 1:1 wrapped asset. It says the bridge uses BitVM2 and zero-knowledge proofs verified on Bitcoin to reduce trust assumptions.
Its documentation includes a guide to deposits and withdrawals. The project lists two audits, but does not specify their providers or findings. Supported destination networks, fees, and detailed redemption terms are also not published.
How Fiamma works
Fiamma describes its BTC bridge as issuing wrapped BTC at a 1:1 peg to Bitcoin. A bridge generally locks or otherwise accounts for BTC on one network and issues a corresponding asset on another, allowing that asset to be used in applications there. Fiamma’s documentation includes instructions for deposits and withdrawals, but the specific supported destination chains and full redemption mechanics are not stated here.
The project says it uses BitVM2 and zero-knowledge proofs verified on Bitcoin to reduce the trust assumptions involved in bridging. These mechanisms are intended to let Bitcoin verify computations related to the bridge; they do not eliminate the possibility of software bugs, operational failures, or a loss of the wrapped asset’s peg.
4 features
Key features
01
Wrapped BTC
Fiamma describes its wrapped BTC as pegged 1:1 to Bitcoin. The terms and process for redeeming it are not specified.
02
BitVM2 verification
The bridge uses BitVM2 and zero-knowledge proofs verified on Bitcoin, with the stated goal of reducing trust assumptions.
03
Deposits and withdrawals
Fiamma documentation includes a guide to making deposits and withdrawals through its bridge.
04
Cross-chain BTC use
The project presents wrapped BTC as a way to use Bitcoin liquidity across blockchain ecosystems. Specific supported destination chains are not stated.
Pros and cons
What we like
- Uses BitVM2 and zero-knowledge proofs in an effort to reduce bridge trust assumptions.
- The wrapped BTC is described as 1:1 pegged to Bitcoin.
- Documentation covers both deposits and withdrawals.
- Two audits are listed.
Watch out for
- The Bitcoin bridge’s supported destination networks are not specified here.
- Fees and the exact deposit and withdrawal timings are not published.
- The names, dates, and findings for the two listed audits are not specified.
- A wrapped BTC bridge carries custody, software, and peg risks that do not apply in the same way to holding BTC directly.
Fiamma fees
Fiamma’s bridge fees are not published. Check the bridge interface and transaction details before confirming a deposit or withdrawal; network fees may also apply.
Is Fiamma safe?
Fiamma lists two audits, but the audit providers, dates, scope, and findings are not specified. Treat that listing as incomplete security information rather than proof that the bridge is safe. BitVM2 and zero-knowledge verification may reduce trust assumptions, but cannot remove smart-contract, implementation, or operational risk.
Using wrapped BTC adds bridge and peg risk to the risk of holding Bitcoin directly. Fiamma’s licensing or regulatory status is not published. Check that using a crypto bridge is legal where you live, and review the current redemption terms before depositing.
5 steps
How to get started with Fiamma
- 1
Read the Fiamma bridge documentation and review its deposit and withdrawal guidance.
- 2
Check which destination networks and wallet types the bridge currently supports.
- 3
Review the displayed fees, transaction steps, and redemption terms before committing funds.
- 4
Start only if you understand the risks of holding wrapped BTC rather than native BTC.
- 5
Verify the destination address and network before confirming a transaction.
Who Fiamma is for
Fiamma is aimed at Bitcoin holders who want to use BTC as a wrapped asset in cross-chain applications and are willing to accept bridge and peg risks. It is less suitable for people who want to hold native BTC without relying on a bridge.
Fiamma FAQs
What is Fiamma BTC?
Fiamma describes its wrapped asset as 1:1 pegged to BTC. The asset ticker FIABTC appears in a search listing, but the current redemption terms and peg mechanism details are not specified.
How does the Fiamma Bitcoin bridge work?
Fiamma says its bridge uses BitVM2 and zero-knowledge proofs verified on Bitcoin to reduce trust assumptions. This does not remove the risks of bridge software, transaction verification, or maintaining a BTC peg.
Which networks does Fiamma support?
The specific destination chains supported by the bridge are not stated. Check the bridge documentation and interface for supported networks before sending BTC.
What are Fiamma’s bridge fees?
Fees are not published. Review the bridge interface and transaction details before confirming a deposit or withdrawal.
Has Fiamma been audited?
Two audits are listed, but their providers, dates, scope, and findings are not specified. Review the audit reports before relying on them as evidence of security.
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How we checked
Sources
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