Zest Protocol, the firm operating Bitcoin’s largest DeFi lending market on Stacks, is in the news today after announcing the launch of a capped mainnet demonstration for its Bitcoin Collateral Vaults. Bitcoin users can now deposit real $BTC into a self-custodial vault on Bitcoin L1 and borrow real $USDC against it, without wrapping or bridging.
Zest Protocol has opened a capped public demo of its Bitcoin Collateral Vaults on mainnet. This marks the first full public-mainnet deployment of its native-Bitcoin collateral vault infrastructure. It will allow users to deposit native $BTC and borrow against it using real assets.
What is Zest Protocol actually doing?
Bitcoin Collateral Vaults are self-custodial vaults on Bitcoin L1, enforced by Bitcoin’s own rules and built for BitVM proof verification. Ordinary DeFi approaches require users to wrap $BTC into a token such as wBTC or bridge it to another chain. However, Zest Protocol keeps the $BTC on Bitcoin, in the user’s own vault, never pooled with other users’ coins.
Proofs of the vault’s state travel to EVM chains, where users borrow stablecoins against it, and proofs of repayment or liquidation on the destination chain govern what happens to the $BTC on Bitcoin. In the mainnet demo, users lock real $BTC and borrow real $USDC, with collateral capped per wallet while the system is proven at scale.
Watch the Bitcoin Collateral Vault process in action – Here
The demonstration runs on mainnet with real $BTC and real $USDC, capped per wallet. Owing to the same, users can test the full flow at small size: deposit $BTC into an individual Bitcoin Collateral Vault and borrow $USDC on Ethereum. Each vault holds one user’s coins only, and the same coins come back on repayment. Caps stay in place until the protocol completes extensive external audits, after which Zest Protocol moves to production launch with institutional partner activations in the lead-up.
Proof of the mainnet demo’s functionality, including Bitcoin transaction hashes, vault addresses, and EVM contract interactions, is available for independent verification on public block explorers here.
Community reactions
According to Tycho Onnasch, Founder of Zest Protocol,
We’ve spent five years on programmable Bitcoin, first on Stacks and now on Bitcoin itself. Today you can put real $BTC in a vault on Bitcoin and borrow against it on mainnet. That’s why Zest Protocol exists: turning Bitcoin from an idle asset into productive capital. We’re very excited to put this in people’s hands.
Here, it’s worth noting that the mainnet demo also carries key lessons from two years of running the Zest Protocol Stacks Market, the largest lending market on Bitcoin L2s, which reached over $100 million in peak TVL with zero bad debt and no $BTC lost.
Bitcoin Collateral Vault borrowers get partial liquidations instead of all-or-nothing, partial withdrawals, and a vault. This will be controlled by one ordinary Bitcoin key, with nothing else to manage.
Tim Draper, Founder of Draper Associates, chipped in too and stated,
I backed Zest Protocol because this team has been building on Bitcoin longer than almost anyone, and they know how to ship great products with amazing user experience. Seeing real Bitcoin collateral working on mainnet, with the coins never leaving Bitcoin, is something I’m incredibly excited about.
All about Zest Protocol and its latest approach
Zest Protocol was founded by core contributors to the Stacks blockchain, including co-architects of the sBTC and Nakamoto upgrades. Prominent investors included Draper Associates (led by Tim Draper), YZi Labs, Trust Machines, Flow Traders, and Asymmetric.
The protocol’s native token, ZEST, was launched in May 2026 via Binance Alpha. It is currently traded on major exchanges including KuCoin, Gate, MEXC, and HTX.
The native self-custodial approach adopted by Zest Protocol tries to remove third-party counterparty risk. Now, while there are hybrid options such as those adopted by Kraken to bypass these native code breaches, they also also elevate centralization risk.
To overcome these two limitations, there are some proposing a new institutional approach. Under the same, users’ physical $BTC will be untouched with regulated custody. Instead, deposits are mirrored and tracked by receipt tokens and used for lending purposes across DeFi.
Even so, Zest Protocol’s latest update remains a step in the right direction.
