Sui Hashi: Native Bitcoin DeFi Without Wrappers

1. What Is Hashi?

Hashi is a native Bitcoin DeFi protocol launched on Sui blockchain in March 2026. It enables direct Bitcoin lending, borrowing, and yield generation without wrapping or bridging. Hashi uses institutional-grade multi-party computation (MPC) custody through BitGo combined with Sui smart contracts to bring actual Bitcoin into DeFi primitives.

The protocol is backed by industry leaders including BitGo (institutional custody), Bullish (exchange infrastructure), FalconX (market making), Ledger (wallet security), and Cubist (research). This backing ensures institutional-grade security from day one.

Hashi launched on Sui devnet around March 19, 2026, with mainnet planned for later in 2026. The protocol underwent formal verification and security audits before mainnet deployment.

2. How Hashi Works: Technical Architecture

Hashi's architecture combines two powerful approaches: MPC custody for Bitcoin security and Sui smart contracts for DeFi logic.

MPC Custody Layer

Bitcoin deposited into Hashi is secured through multi-party computation (MPC). No single entity controls the private keys—instead, key fragments are distributed across multiple institutional operators including BitGo and others. This means:

• Bitcoin remains on Bitcoin blockchain (not wrapped)
• Private keys never exist in single location
• Custody is distributed across multiple institutions
• Institutional-grade security standards applied

Sui Smart Contract Layer

While Bitcoin sits safely in MPC custody, Hashi's smart contracts on Sui manage collateral positions, lending pools, and DeFi logic. When you deposit BTC:

1. Your Bitcoin is locked in institutional MPC custody
2. You receive a representation on Sui (hBTC or similar) tracking your position
3. You use hBTC in Sui DeFi: lending pools, yield strategies, collateral for borrowing
4. Smart contracts maintain collateral ratios and liquidation logic
5. When you exit, your BTC is released from custody back to you

Collateral Management

Sui's object-centric model makes collateral management efficient. Each position is an object with properties tracked on-chain. The smart contracts enforce collateral ratios, automate liquidations at thresholds, and enable complex multi-asset positioning without central intermediaries.

3. Key Features of Hashi

Hashi enables multiple DeFi primitives for Bitcoin holders:

BTC Lending & Borrowing

Deposit BTC to earn yield in stablecoins or other assets. Borrowers can use BTC as collateral to access liquidity without selling. This creates a native Bitcoin credit market on Sui.

BTC Yield Generation

Unlike holding BTC on an exchange or wallet, Hashi enables passive yield generation. Supply BTC to lending pools and earn interest from borrowers. Yield rates fluctuate based on demand and risk parameters.

BTC-Backed Bonds

Hashi enables the issuance of bonds collateralized by Bitcoin. These provide structured returns for conservative investors wanting exposure to BTC appreciation with fixed income.

Insurance on BTC Collateral

Hashi includes optional insurance protocols protecting against custody failures or smart contract exploits. Users can pay premiums to insure their positions against tail risks.

4. Why Sui Blockchain?

Hashi was built on Sui for specific technical reasons. Understanding these reveals why Sui excels for complex DeFi protocols.

Object-Centric Model

Sui treats blockchain data as objects, not accounts. Each user position (collateral, debt, yield) is an object with properties. This design enables fine-grained ownership and efficient parallel processing of independent transactions. Collateral management becomes simpler and more efficient.

Parallel Execution

Ethereum and Bitcoin process transactions sequentially—each transaction waits for the previous one. Sui processes non-conflicting transactions in parallel. When thousands of users are depositing, borrowing, and withdrawing BTC simultaneously, Sui handles it without bottlenecks or fee spikes.

Sub-Second Finality

Sui achieves transaction finality in under one second. For time-sensitive DeFi operations (liquidations, settlement), this matters. You don't wait for block confirmations—your transaction is final instantly. This enables responsive risk management.

Move Language & Formal Verification

Sui's Move language (borrowed from Libra/Diem) was designed for formal verification. Before mainnet launch, Hashi's smart contracts underwent formal verification—mathematical proofs that the code behaves as intended. This is stronger than standard audits and critical for custody protocols.

5. Institutional Partners Behind Hashi

Hashi isn't built by unknown developers—it's backed by the most reputable names in crypto infrastructure. Here's what each brings:

BitGo

BitGo is the largest digital asset custodian, managing billions in institutional assets. They provide the MPC infrastructure securing Bitcoin deposits. BitGo's insurance backing adds another layer of security. This is the difference between amateur custody and institutional-grade protection.

Bullish

Bullish operates institutional-grade exchange infrastructure. Their involvement ensures liquidity, order books, and trading infrastructure for hBTC and other Hashi tokens. They bring market-making expertise and prevent thin liquidity problems.

FalconX

FalconX specializes in algorithmic trading and market microstructure. They ensure pricing is fair, prevent front-running, and provide technical market infrastructure. Their quant expertise helps optimize collateral management.

Ledger

Ledger secures billions in crypto assets via hardware wallets. Their involvement means Hashi will integrate with Ledger wallets, enabling users to interact with the protocol directly from their hardware-secured accounts. This is significant for institutional users.

Cubist

Cubist conducts cutting-edge DeFi research and protocol design. Their involvement in formal verification and economic modeling ensures Hashi's mechanics are sound. They also advise on security best practices.

6. Hashi vs Other BTCFi Solutions

Bitcoin DeFi is exploding, but different protocols take different approaches. Here's how Hashi compares:

7. Risks & Considerations

Hashi is institutional-grade, but it's still early-stage. Be aware of risks:

MPC Custody Trust Assumptions

MPC distributes custody across multiple parties, but participants are known institutions. You're trusting that BitGo and partners remain solvent, secure, and honest. Regulatory actions against any party could impact custody.

Smart Contract Risk

Formal verification reduces but doesn't eliminate smart contract risk. Sui blockchain itself could be exploited (unlikely but possible). Always verify audits and formal verification reports before deploying significant capital.

Regulatory Uncertainty

Regulators are still deciding how to treat Bitcoin custody in DeFi. Hashi's institutional backing helps, but sudden regulatory action could restrict access or force changes. This is tail risk but real tail risk.

Liquidation Risk

If you use BTC as collateral to borrow, market downturns trigger liquidations. A 40% BTC crash could liquidate undercollateralized positions. Always maintain safe collateral ratios and understand liquidation mechanisms.

Liquidity Risk

During extreme market stress, liquidity can dry up. You might not be able to exit positions quickly at fair prices. This is especially relevant for less-liquid yield strategies.

8. Timeline & How to Get Involved

Hashi is live on Sui devnet and preparing for mainnet. Here's what to expect and how to prepare:

Current Status: Devnet (March 19, 2026)

Hashi launched on Sui devnet, enabling developers and early users to test the protocol. Devnet uses testnet assets (no real money). This is your chance to understand the interface without risk.

Security Phase: Audits & Formal Verification

Before mainnet, Hashi underwent third-party audits and formal verification to ensure smart contract correctness. Look for published audit reports and verification certificates on the official website.

Expected: Mainnet Later in 2026

Mainnet launch will enable real Bitcoin deposits and yields. Monitor official announcements for exact timing. Mainnet will likely start with limited capacity (cap on total BTC accepted) and gradually scale.

How to Prepare Now

1. Set up Sui wallet: Get a Sui wallet (Sui Wallet browser extension or Ledger). Familiarize yourself with managing assets on Sui.
2. Understand the mechanics: Read this guide multiple times. Follow the links to understand BTCFi trends and Sui blockchain architecture.
3. Test on devnet: Once available, grab devnet assets and practice depositing, borrowing, and yielding. Mistakes on devnet are free.
4. Monitor announcements: Follow official Hashi channels for security audit releases, formal verification reports, and mainnet timeline updates.
5. Start small on mainnet: When mainnet launches, begin with small BTC amounts. Gradually increase as you gain confidence and verify security reports.
6. Participate in governance: Hashi will likely have governance tokens. Understand voting mechanisms and participate in protocol decisions.

9. Frequently Asked Questions

Continue Learning