ZenBTC

zenBTC is the first Decentralized Custody Token (DCT) for Bitcoin on Solana — a yield-bearing wrapped BTC asset that keeps the underlying coins on the Bitcoin blockchain in decentralized custody while letting holders participate in Solana's DeFi ecosystem and earn daily returns paid in actual satoshis. It is developed by Zenrock Labs and incubated by 50T Fund, the digital asset investment firm run by macro investor Dan Tapiero.

Background and Origins

Zenrock Labs emerged in early 2024 from the restructuring of Qredo, a crypto custody platform that entered administration. Dan Tapiero's fund — operating as 50T Fund (formerly 10T Holdings and 1RoundTable Partners), managing over $2 billion in AUM — acquired substantial Qredo assets through a combination of private lending, debt financing, and bankruptcy workout. That acquisition became the foundation for Zenrock, which reoriented around building decentralized custody infrastructure. Co-founders Jack Krevitt and Aditya Dave lead day-to-day operations under Tapiero's strategic direction. Zenrock has received backing from Spartan Group and Maven 11.

How zenBTC Works

The core of zenBTC is Zenrock's distributed multi-party computation (dMPC) technology. Rather than holding Bitcoin in a single wallet controlled by one entity, dMPC distributes the management of Bitcoin private keys across a network of independent operators. Each key fragment runs inside a hardware-isolated secure enclave. No single operator ever reconstructs the complete private key. Transactions are signed collaboratively, and the system includes proactive key refreshing to reduce collusion risks and accountability mechanisms through identifiable aborts. The implementation is compatible with EdDSA, which enables direct compatibility with Solana.

When a user deposits Bitcoin, the BTC remains on the Bitcoin blockchain under dMPC-based custody. Zenrock's purpose-built Layer 1 blockchain, zrChain, manages the custody operations and minting logic. zenBTC tokens are then issued on Solana representing the custodied Bitcoin at a 1:1 ratio. When a user redeems, the zenBTC is burned and the underlying BTC is released. The Bitcoin is never lent out and never rehypothecated. Redemption takes approximately seven days.

Yield Mechanism

zenBTC's yield is generated entirely from Zenrock network fee revenue, not from token emissions or lending. Specifically, 5% of all zrChain network fees and 35% of zenBTC custody fees flow to zenBTC holders. The mechanism is self-balancing: as Zenrock earns more fees, yield per zenBTC rises; as more users mint zenBTC to capture that yield, total supply increases and the per-token rate normalizes. Payouts are made daily in native Bitcoin, not in governance tokens or secondary assets. Because zrChain underpins multiple products — zenBTC, zenZEC, Hush Protocol, and any future assets — zenBTC holders benefit from the total fee volume the network generates across all products. The annualized yield since inception stood at approximately 1.59% as of February 28, 2026.

zrChain Infrastructure

zenBTC is one product built on top of zrChain, Zenrock's purpose-built custody Layer 1 blockchain. zrChain runs a modified Tendermint consensus with dual virtual machine support (CosmWasm and EVM), sub-second finality, and built-in compliance modules. The validator network spans 42 validators across 22 countries and 5 continents, with a stated uptime SLA of 99.99%. The ZenTP bridge, deployed in January 2025, handles cross-chain transfers between zrChain and Solana. Zenrock describes the overarching standard for assets like zenBTC as Decentralized Custody Tokens (DCTs).

Beyond zenBTC, Zenrock has extended the same infrastructure to other assets. zenZEC launched on October 31, 2025, bringing Zcash to Solana under the same dMPC custody model; by early 2026 it had surpassed $15 million in Solana trading volume. Hush Protocol launched in February 2026 as a zero-knowledge privacy layer for Solana, using STARK-based proofs to enable shielded, yield-composable transactions. The $ROCK token is zrChain's native token, with a fixed supply of one billion and no inflation; staking ROCK earns a share of protocol revenue.

Solana Integration

zenBTC launched on Solana in mid-2025 and has integrated with the major liquidity venues in the ecosystem. Active integrations include [[PROJECT:303]] (Kamino Finance) for lending markets, automated yield strategies, and Liquidity Vaults, as well as Orca, Meteora, Jupiter, Raydium, and Phantom wallet. Trading pairs include zenBTC/cbBTC, zenBTC/USDG, and zenBTC/jitoSOL. Zenrock distributed 2.8 million ROCK tokens over 13 weeks (200,000 per week in the foundation phase, scaling to 400,000 in the expansion phase) to incentivize early liquidity provision.

The project reported over 160 BTC in custody and more than $20 million in total value locked as of early 2026, reaching those levels within approximately four months of mainnet launch. The Solana token for zenBTC trades under the mint address 9hX59xHHnaZXLU6quvm5uGY2iDiT3jczaReHy6A6TYKw.

Security and Audits

Halborn conducted a security assessment of zrChain's core modules — covering identity, policy, treasury, and validation systems — from August through September 2024. The audit identified six findings: zero critical, one high severity (resolved), one medium severity (resolved), two low severity (one resolved, one risk-accepted), and two informational. Zenrock reports that 100% of reported findings were resolved prior to mainnet launch. Informal Systems has also audited components of the Zenrock stack, including the Hush Privacy Protocol. The dMPC key management design means private keys are never fully reconstructed and each fragment operates inside a hardware-isolated secure enclave, eliminating the single-custodian failure mode that has driven a large share of historical DeFi losses from off-chain key theft.

Market Context

Solana has become one of the most active chains for Bitcoin holders seeking DeFi yield, accounting for roughly 59% of wallets trading BTC on-chain while holding less than 25% of the overall wrapped Bitcoin market by supply. By early 2026, wBTC's dominance on Solana had fallen to roughly 45% from near-total control in 2023, reflecting structural demand for decentralized and yield-generating alternatives. zenBTC is positioned as a decentralized alternative to centrally issued wrapped BTC products such as wBTC (custodied by BitGo) and cbBTC (custodied by Coinbase). The self-balancing, fee-derived yield model is the primary differentiator from competitors that depend on lending or inflationary emissions.