Hashi has launched a testnet on Sui that gives developers a sandbox to experiment with a Bitcoin-backed lending design using native BTC as collateral and a layered security model Hashi calls the Guardian Layer.
What Hashi is building
- At its core, Hashi aims to let Bitcoin support lending on Sui without relying on simplistic cross-chain assumptions. Instead of wrapped BTC or a single custodian, the design uses multi-layer transaction security: MPC (multi-party computation) threshold signatures plus a 2-of-2 multisig flow between validators and independent guardians. That split-signature approach is intended to increase separation of duties and make unauthorized movement of BTC harder.
Why this matters
- Bitcoin is the largest crypto asset, but its base layer wasn’t built for the same smart-contract activity found on chains like Sui, Ethereum, or Solana. For years projects have tried to make BTC usable in DeFi via wrappers, bridges, custodial tokenizations, or sidechains. Lending—locking BTC as collateral to borrow stablecoins or other assets—is one of the most obvious, valuable use cases, but it brings critical custody and verification questions. Hashi’s Guardian Layer is a deliberate attempt to address those issues with extra checkpoints and role separation rather than trusting a single signing flow.
Technical but purposeful
- The architecture is technical by necessity: MPC threshold signatures, a 2-of-2 multisig between validators and guardians, and layered transaction checks. The technical complexity is meant to trade off convenience for stronger controls — a recognition that moving BTC across chains is risky and should be defended by multiple independent mechanisms.
Why the testnet matters
- This is a testnet, not a mainnet product holding real user BTC at scale. That distinction is crucial. The point of a testnet is to let security researchers and developers probe the model, break things, and expose edge cases before any real funds are entrusted to the system. For BTC-backed lending the first and most important question should be: does the security model work? TVL comes later.
What this means for Sui
- For Sui, Hashi adds a concrete experiment in bringing Bitcoin liquidity to a high-performance Layer 1 that markets itself on fast execution and object-based architecture. The pitch isn’t just “build on Sui”; it’s “bring the largest crypto asset into Sui DeFi in a structured, security-focused way.” That could attract builders interested in lending markets, stablecoin borrowing, and other BTC-collateralized primitives—if the security story holds up.
Caveats and the path forward
- No cross-chain BTC model is risk-free. Smart-contract bugs, signing failures, governance errors, validator compromises, and economic attacks remain possible. Layered security is an improvement, not a panacea. For Hashi to move beyond experiment status it will need rigorous audits, clear documentation, and real developer adoption. Only after surviving adversarial testing and proving it can protect funds should TVL and growth be the focus.
Bottom line
- Hashi’s Sui testnet is a meaningful, prudent experiment: it doesn’t oversell itself as mainnet-ready BTC lending, but it tackles a real problem with a thoughtful security-first architecture. Whether it becomes a core piece of Sui’s DeFi stack will depend on the results of testing, audits, and developer uptake.
Source
- This report is based on Hashi’s Sui testnet materials published in the project’s GitHub repository and primary disclosures. Written by the News Desk; edited by Samuel Rae.
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