All posts
Bitcoin bridge: bridge native BTC to DeFi & Ethereum
Moving native Bitcoin into DeFi used to mean wrapped tokens and trust assumptions. Here's how bridging BTC to ETH now works both ways, what it costs, and where your coins actually go.
Updates

Numbers
Proven performance
TL;DR
Key takeaways
Symbiosis launched a two-way Native Bitcoin Bridge, moving real BTC between Bitcoin and EVM chains, not wrapped tokens.
Bridging works both ways with Bitcoin Sidechains (Merlin, Rootstock), Ethereum, BNB and ZKsync at launch.
Transfers finish in minutes, while similar native BTC bridges take 2 to 5 hours.
Four parts run it: BTC Portal, Relayers Network, syBTC on ZKsync Era, and the BTC Forwarder.
Decurity audited the bridge; users get a quote and a unique BTC address, then receive their target token.
6 minute reading
Updates
Introducing the Native Bitcoin Bridge
This release sets a new benchmark in the DeFi industry.
The truth is - it does.
Symbiosis presents the Native Bitcoin Bridge.
Having it in the back office for some time to excel it before the public launch, we can’t wait to let you use it and explore the expanded cross-chain world of Bitcoin.
While you can simply go straight to the BTC Bridge, we advise you to go through this introductory article first - to present one of our key releases of 2024, step-by-step.
BTC bridge at Symbiosis: how it all started
Let’s get back a little bit on the timeline to January this year.
In the beginning of 2024, we announced the one-way Bitcoin bridge, powered by ThorChain. This event marked the first appearance of the Native Bitcoin into Symbiosis Protocol and paved the way for the upcoming Any-BTC-Any Bitcoin Bridge.

The first project blueprints and the trajectory of the full availability of the Native Bitcoin appeared in the middle of the last year. Since then - we’ve been non-stop working and enhancing our complete DeFi gateway that would connect Bitcoin the most cross-chain way possible. And we think we made it successfully!
The need for the cross-chain native Bitcoin is here
By introducing and launching the Bitcoin Bridge, we aim to solve several problems and meet the demands of the users that interact with Bitcoin within DeFi tools. There’s no need to get into the details on Bitcoin’s importance. BTC is the most capitalized asset, occupying approx. 56% of the overall market with over $1 trillion liquidity. Due to the architecture and network specifications of Bitcoin as a blockchain and a coin, the asset is not able to fully take part in the DeFi and cross-chain processesю Our Bitcoin Bridge’s goal is to remove most of these limits - by connecting BTC with Layer 2 networks and letting users move their Bitcoin funds more freely. Symbiosis is not the first protocol in the DeFi space to produce such a solution, and this is how our approach is unique in its own way.
Current state of Bitcoin bridges: problems and solutions
Our motto at Symbiosis is to deliver products that DeFi as an industry and users in DeFi deserve. Going deeper into 2024, the Bitcoin Bridge space was having several gaps:
Wrapped Bitcoin version’s prevalence. Most bridge protocols made exactly the wrapped Bitcoin available for bridge, missing the Native Bitcoin. While several WBTC-like tokens are useful in specific occasions, the original BTC funds are being limited to entering the cross-chain;
Inconvenient process of bridging to and from Bitcoin. When exchanging the exact funds to BTC or vice versa, users make numerous manual transfers to get to the final destination asset. It leads to the extra gas fees, change in the received amount, etc;
Majority of BTC liquidity circulating in the centralized platforms. Some of the popular “BTC Bridges” lack the core attribute of Bitcoin - decentralization. This not only creates the space to dictate the unfair price exchange rates but also puts a risk on the funds. Also - a decentralized asset on the centralized platform? Well, that’s definitely a choice.
Lack of pairs available for Native Bitcoin Bridge: it’s difficult when you try to bridge from Bitcoin to an ERC-20 token via one sole platform, with low fees and the amount under $100. The route may simply not exist;
We built this bridge not just for the users or businesses, but for the industry: its players and participants. It was designed to meet the needs of BTC L2 networks that can now get secured and prompt bridge for the native Bitcoin, having an opportunity to outsource the transfers of Bitcoin. If we focus more on Layer 2 networks, some of these protocols will get the Symbiosis’ version of Bitcoin - syBTC - for the Bitcoin DeFi processes. Interoperability of syBTC with restacking and staking protocols, integrating a way more convenient solution for Bitcoin exchanges in pockets of crypto wallets and aggregators’ users - our BTC Bridge is here to simplify and accelerate the cross-chain connection of Bitcoin and DeFi. And here’s what’s hidden under the hood of our Bitcoin Bridge
Spoiler: it’s not magic, just the smart contracts, Relayers, and BTC Forwarders.
FAQs
Got questions?
Still have questions? Contact us and we’ll help you out.
01
Can you bridge BTC to ETH with Symbiosis?
Yes. The Symbiosis Bitcoin Bridge supports routes both from and to EVM networks, so you can bridge native BTC to tokens on Ethereum, BNB, ZKsync, and Bitcoin sidechains like Merlin and Rootstock — all in one interface.
02
How does the bridge move BTC without smart contracts?
Bitcoin lacks on-chain logic, so the BTC Forwarder acts like a Solver executing your intent. It detects your Bitcoin transaction, locks funds in the BTC Portal via MPC threshold signatures, then the Relayers Network mints syBTC on ZKsync Era to convert into your target token.
03
What is native BTC versus wrapped Bitcoin?
Native BTC is the original coin on the Bitcoin blockchain. Wrapped versions like WBTC are ERC-20 representations held 1:1 by a custodian. Symbiosis bridges native BTC rather than requiring you to start with a wrapped token.
04
How long does the Symbiosis BTC bridge take?
Minutes. Similar native Bitcoin bridges can take 2 to 5 hours, but the Symbiosis Bridge handles transfers in minutes thanks to its Relayers Network and BTC Forwarder architecture.
05
Is the Symbiosis Bitcoin Bridge audited?
Yes. The Any-BTC-Any Bridge was audited by Decurity. Funds are locked using MPC threshold signature scheme (TSS) via the Relayers Network rather than a single custodian.
06
How is this different from wBTC or cbBTC?
WBTC and cbBTC rely on centralized custodians (BitGo, Coinbase) holding your BTC 1:1 off-chain. Symbiosis locks native BTC via MPC TSS through its Relayers Network, keeping the process decentralized while bridging across multiple chains.
07
Can I bridge from a token back to native BTC?
Yes. The protocol exchanges your token to WBTC, then the Relayers detect the event, unlock and burn syBTC, and transfer native BTC from the BTC Portal to your specified Bitcoin address. No upfront BTC deposit needed for this direction.
08
What's coming next for the BTC bridge?
Symbiosis plans lower fees on BTC-EVM routes with variable destination tokens, support for BRC-20 tokens and Runes, and synthesizing syBTC on Ethereum for integration with BTC staking and re-staking protocols.
Learn more
Bridge guide
Bitcoin testnet bridge: swap BTC to EVM & back
Native BTC finally moves across chains without wrapped tokens. We'll walk through how the signet and testnet routes work, why atomic swaps matter here, and how to convert WBTC to BTC during testing.
Read article
How to bridge BTC to DeFi: native Bitcoin in DeFi
Wrapped tokens used to be the only way into DeFi. Now bitcoin-native dapps let your BTC earn yield and move across EVM chains with real cross-chain settlement behind it.
Read article
Best way to swap Bitcoin cross-chain (no KYC)
We compare the best Bitcoin bridges and cross-chain DEX options for 2025, where native BTC support actually works, what fees to watch, and how to move Bitcoin to other chains without giving up custody.
Read article
Swap crypto across 50+ networks
Non-custodial. No KYC. Connect your wallet and get started.




