BitcoinOS (BOS) completed the first-ever bridgeless transfer of Bitcoin. From the Bitcoin network to the Cardano mainnet and back.
No custodians. No wrapped assets managed by third parties. Just pure, seamless cross-chain movement. A major step forward for BTC interoperability
BOS Unlocks First-Ever Bridgeless BTC Transfer with xBTC and BitSNARK
The process began with BOS locking 1 BTC on Bitcoin Layer 1 using its own trustless protocol called BitSNARK. This created a new kind of token: xBTC. Unlike traditional wrapped tokens that rely on centralized vaults or intermediaries, xBTC is non-custodial, cryptographic, and programmable. It lives natively on Bitcoin, acting more like wETH on Ethereum. But without needing to leave the Bitcoin network in the traditional sense.
BOS then sent that 1 xBTC directly from a Bitcoin wallet to a Cardano wallet owned by Sundial Protocol. No bridge, no delays—just a clean, end-to-end transfer using UTXO models shared by both blockchains.
BOSes – we did it.
On May 4 2025, we successfully demoed the first *bridgeless* transfer of BTC between Bitcoin and Cardano mainnet.
Performed with @SundialProtocol and @adahandle, using our all-new unchained token standard.
Here’s what happened.
pic.twitter.com/JO9xZKrLUE
— BitcoinOS (@BTC_OS) May 5, 2025
From there, the story got even more interesting. Sundial forwarded the 1 xBTC to Handle’s Cardano wallet. Then, Handle sent it back to BOS’ original Bitcoin wallet, where it was unwrapped and restored to standard BTC. Throughout all of this, no custodian ever touched the funds. Everything happened over the unchained xBTC standard—secured entirely by BitSNARK’s cryptographic guarantees.
Why It Matters
This breakthrough addresses one of crypto’s biggest friction points: moving BTC across chains without relying on bridges. Bridges have historically been one of the most vulnerable parts of the crypto ecosystem. Chainalysis reports that over $2 billion was stolen from cross-chain bridges in 2022 alone.
By removing bridges from the equation, BOS and its partners reduce attack surfaces and restore the original spirit of decentralization, while unlocking new functionality. Developers can now integrate BTC into Cardano DeFi apps, wallets, or dApps without worrying about third-party risks or added complexity.
Here’s a developer-side view of our full, step-by-step process of moving BTC between Bitcoin and Cardano – without a bridge.
Observe to learn more about the tech behind “unchained tokens” before everyone else.
pic.twitter.com/82OFKdENVm
— BitcoinOS (@BTC_OS) May 5, 2025
One real-world example? Lending protocols could soon accept native BTC as collateral on Cardano, creating new yield opportunities for holders while keeping assets secured by Bitcoin’s network.
Looking Ahead
BitcoinOS’ bridgeless demo is more than just a tech showcase—it’s a sign that seamless, secure cross-chain flows are finally within reach. With xBTC, the BOS team is paving the way for broader BTC utility without compromising security or decentralization.
As Cardano and Bitcoin continue to evolve, the ability to move value between them freely could spark a new wave of innovation.
Disclaimer
The information discussed by Altcoin Buzz is not financial advice. This is for educational, entertainment, and informational purposes only. Any information or strategies are thoughts and opinions relevant to the accepted risk tolerance levels of the writer/reviewers, and their risk tolerance may differ from yours. We are not responsible for any losses you may incur due to any investments directly or indirectly related to the information provided. Bitcoin and other cryptocurrencies are high-risk investments, so please do your due diligence. Copyright Altcoin Buzz Pte Ltd.
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