Bitcoins
Starknet has introduced strkBTC, a new wrapped bitcoin asset that enables users to shield their balances and transaction history using zero-knowledge proofs.
Announced on February 26, 2026, strkBTC is a native Starknet asset designed to solve bitcoin’s “transparency problem.” While bitcoin is a global store of value, its public ledger exposes every transaction and balance to the world. strkBTC allows bitcoin holders to bridge their BTC to Starknet and choose between two modes: Unshielded (standard public ERC-20 behavior) and Shielded (private balances and transfers).
The asset is issued deterministically based on verifiable bitcoin deposits, ensuring the supply always mirrors real BTC on a 1:1 basis. By utilizing Starknet’s validity rollup architecture, strkBTC preserves the composability of decentralized finance ( DeFi)—meaning you can theoretically use shielded bitcoin as collateral for a loan without revealing your total net worth to the public.
“strkBTC is an innovation that goes beyond [performance vs. privacy]… It enables private use of bitcoin in DeFi while preventing capital isolation,” says Eli Ben-Sasson, co-founder of Starkware.
🛡️ Privacy vs. Secrecy: The “Viewing Key”
Starknet has opted for a “practical privacy” model rather than total anonymity to ensure the asset remains compliant with global regulations:
Shielded by Default: To the general public, your transaction amounts and counterparties are hidden.
Selective Disclosure: Users generate an encrypted Viewing Key. This key can be shared with auditors, tax authorities, or regulators to reconstruct a specific transaction trail if required by law.
Reversibility: Users can move between shielded and unshielded modes depending on whether they need privacy for a trade or transparency for an institutional workflow.
🧭 FAQs
How do I get strkBTC? You can mint strkBTC by depositing native bitcoin through a verified bridge (such as Atomiq Labs) onto the Starknet network.
Can I earn yield on my private bitcoin? Yes. strkBTC is eligible for bitcoin staking on Starknet, allowing users to earn rewards while keeping their balances shielded.
Is strkBTC a “mixer”? No. Unlike mixers that pool funds to hide their origin, strkBTC uses zero-knowledge cryptography at the protocol level and includes built-in auditability features to discourage illicit use.
What are the main use cases? Posting collateral without exposing a balance sheet, executing trading strategies without “leaking” intent to the market, and private cross-border settlement.
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