Hashi has opened a testnet on Sui that gives developers a sandbox to experiment with Bitcoin-backed lending using native BTC as collateral — and a fresh security model intended to reduce some of the usual cross-chain risks.
What Hashi built
- Native BTC collateral on Sui: rather than relying on wrapped or synthetic BTC, Hashi’s design centers on letting Bitcoin support lending activity on Sui in a more structured way.
- Guardian Layer: an extra security checkpoint around BTC-backed transfers. The flow adds separation of duties and authorization checks instead of a single-signature or simple bridge handoff.
- Multi-layer signing: the protocol’s GitHub docs describe MPC (multi-party computation) threshold signatures paired with a 2-of-2 multisig between validators and independent guardians. In practice that means two distinct parties must cooperate to move funds, reducing single-point-of-failure risk.
Why this matters
Bitcoin is the largest crypto asset, but its base layer wasn’t made for complex smart-contract lending. Historically, using BTC in DeFi has required wrappers, custodians, sidechains, or synthetic tokens — each with trade-offs around custody and trust. Lending is an obvious use case: let BTC holders borrow stablecoins or other assets without selling. But cross-chain collateral raises hard questions: who controls transfers, how is custody verified, and what happens when a signing system or bridge fails?
Hashi’s approach doesn’t make those problems disappear, but it explicitly addresses them by adding layered security and role separation. That’s a more disciplined way of bringing BTC into a fast L1 like Sui, which emphasizes high throughput and developer-friendly primitives.
Why the testnet stage matters
This is a testnet, not a mainnet product. No real BTC should be assumed secure here at scale. The testnet gives developers and auditors the chance to:
- Inspect the architecture and code,
- Probe edge cases and failure modes,
- Stress signing flows, multisig and guardian interactions,
- Evaluate whether the security model holds up under adversarial conditions.
A note on risk and TVL
No cross-chain BTC model is risk-free. Smart contract bugs, signing failures, governance errors, and economic attacks remain possible. That’s why the crucial early question is not “How much TVL will this attract?” but “Does the security model actually work?” BTC holders are often conservative; they’ll want strong proofs — audits, documentation, and demonstrated robustness — before moving exposure into another chain’s lending markets.
What to watch next
Hashi’s testnet is a pragmatic experiment: it doesn’t claim to be a ready-made BTC lending market, nor evidence that Sui has absorbed major Bitcoin liquidity. But if the project moves from testnet to mainnet with rigorous audits, clear docs, and developer uptake, it could become an important piece of Sui’s DeFi stack by giving builders a structured path to add BTC collateral.
Source and credits
This report is based on Hashi’s Sui testnet materials published in its GitHub repository and primary disclosures. Written by the News Desk; edited by Samuel Rae.
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