Starknet officially launched strkBTC on May 12, a token that wraps Bitcoin onto its layer-2 network with a privacy twist. Unlike standard wrapped Bitcoin, strkBTC lets users hide balances and transactions behind shielded balances, with viewing keys available for selective disclosure to an independent auditor. The project went from concept to mainnet in just over a month — 32 days, per the team's disclosed timeline.
How strkBTC works
StrkBTC locks Bitcoin on the base layer and mints an ERC-20 equivalent on Starknet. Users can choose between public mode, which works like WBTC, and shielded mode, where balances and transfers are encrypted. A five-member federation manages the movement of BTC between chains, with plans to reduce reliance on that trust model over time. Atomiq and Garden are already providing bridge routes from BTC and WBTC into strkBTC.
Why privacy on Bitcoin matters
Bitcoin's ledger is transparent by design. That's fine for many use cases, but not for entities that want to keep wallet balances or transaction history private. That gap has pushed privacy development to adjacent systems. strkBTC joins a field that already includes Liquid, which uses Confidential Transactions but still relies on a federation; WBTC paired with RAILGUN for EVM privacy; Fedimint and Cashu for custodial privacy; and 0xbow's Privacy Pools with zero-knowledge proofs. Each has its trade-offs. Liquid hides amounts but requires trust in the federation. strkBTC adds federation, bridge, smart contracts, and an auditor layer. RAILGUN requires WBTC already bridged to Ethereum. Fedimint privacy depends on federation honesty. Cashu is fast but relies on mint custody.
32 days from thesis to product
The accelerated development timeline shows how quickly Starknet moved. The privacy argument was published April 10. By April 20, v0.14.2 was live with proof verification and encrypted balance infrastructure. Liquidity from Atomiq and Garden was confirmed April 28. The federation was disclosed May 7. The product went live May 12. That's rapid execution for a project that touches Bitcoin's base layer.
Starknet has said the federation model is a starting point, with a roadmap toward greater trust minimization. No specific deadline has been set for that transition. For now, users can access strkBTC through Atomiq and Garden bridges. Whether the shielded mode gains traction among privacy-conscious Bitcoin holders — or draws regulatory attention — is still unclear.
