Borrowing Against Your Bitcoin Without Giving Up Your Keys? Inside Sui’s New Hashi Framework and What It Means for Your Portfolio

Bitcoin holders have long faced a frustrating choice: let their assets sit idle in cold storage, or hand over their private keys to centralized lending firms just to earn a yield. That high-risk trade-off is about to change with the upcoming global testnet launch of Sui’s new Hashi framework in July 2026. This decentralized protocol aims to unlock a portion of the estimated $1 trillion in dormant Bitcoin by allowing users to borrow stablecoins or earn yield directly on the high-speed Sui network—all while keeping their native Bitcoin safely locked on the Bitcoin blockchain.

By David Chen | July 3, 2026

The Strategy Outline

For years, the decentralized finance (DeFi) world has been divided. On one side sits Bitcoin, the world’s largest cryptocurrency with an estimated $1 trillion in total market value, largely sitting idle in wallets. On the other side are high-speed smart contract networks like Sui, which run advanced financial applications like decentralized lending and borrowing. The challenge has always been connecting the two.

Historically, investors had to rely on synthetic or wrapped tokens—which act like digital IOUs representing Bitcoin on another network. But wrapping tokens requires trusting a central custodian or a multi-signature bridge. If that custodian goes bankrupt or the bridge gets hacked, your digital IOUs become worthless. The strategy behind Hashi, a native primitive developed by Mysten Labs, is to completely bypass these risks. Instead of moving your Bitcoin to another blockchain, Hashi keeps the actual Bitcoin locked securely on its native network while generating a cryptographic proof on the Sui blockchain.

By eliminating these risky intermediaries, the Hashi framework opens the door for a massive wave of capital—commonly referred to as “BTCFi” (Bitcoin Finance). Backed by a coalition of institutional players including BitGo, Cumberland, SwissBorg, FalconX, and Ledger, the protocol allows everyday investors to pull cash out of their Bitcoin holdings without having to sell their coins and trigger expensive tax events.

Smart Contract Architecture

To understand how Hashi accomplishes this without custody transfers, we have to look at how its smart contracts behave. On the Sui blockchain, assets are treated as independent digital objects. This is different from traditional blockchains that use a ledger sheet to keep track of balances. Think of Sui’s model like keeping physical coins in separate drawers in a desk. Because these assets are distinct objects, Sui can run multiple transactions at the same time—similar to opening several checkout lanes at a grocery store instead of forcing everyone to wait in a single line. This structural speed makes managing complex financial agreements and loan liquidations incredibly efficient.

The system uses threshold cryptography—a security design where the private keys needed to control a wallet are divided into multiple pieces and distributed among independent network validators. When you deposit your Bitcoin, it is sent to a unique vault address. Control of this vault is split among these validators; no single entity can access your funds. Once the network confirms your deposit on the Bitcoin network, Hashi’s smart contracts mint a secure digital collateral certificate on the Sui network.

This certificate acts as a smart digital receipt. You can take this receipt and deposit it into popular Sui lending platforms like Navi, Scallop, or Suilend. The platform recognizes the certificate as high-quality collateral, allowing you to borrow stablecoins or other assets against it. To keep the loans safe, Hashi integrates with CF Benchmarks, a regulated index provider that monitors the real-time price of Bitcoin (which is currently trading at $61,889 according to the latest price snapshot). This ensures that the smart contracts always have an accurate, manipulation-resistant view of your collateral’s value.

Risk vs. Reward

For any retail investor, weighing the benefits against the potential pitfalls is crucial. The primary reward of the Hashi model is the elimination of counterparty risk. You no longer have to send your funds to a centralized exchange or lender that could disappear overnight. Instead, the rules are governed by open-source code. You retain ultimate control over your assets on the Bitcoin network, while putting them to work in DeFi to earn interest or borrow cash.

However, no system is entirely without risk. Investors must be aware of the following factors before participating:

• Liquidation Risk: Because Bitcoin is currently trading at $61,889, its value shifts constantly. If the market experiences a sharp decline and your collateral value drops below a set ratio, the smart contracts will automatically sell your locked Bitcoin to protect the lenders from losing money.
• Smart Contract Vulnerabilities: Even though the protocol is built on Sui‘s highly secure programming language, new code can contain unexpected bugs or vulnerabilities. A flaw in the code could expose certificates or locked funds to exploiters.
• Confirmation Delays: The Bitcoin network is notoriously slow, often requiring multiple block confirmations that can take a significant amount of time. During times of heavy network congestion or high market volatility, this delay could make it harder to quickly add collateral to a borrowing position to avoid liquidation.

Step-by-Step Execution

Using the Hashi framework to unlock value from your portfolio involves a straightforward process once the protocol moves from testnet to mainnet. Here is how a regular investor executes the strategy:

First, you must set up a secure Sui-compatible web wallet alongside your native Bitcoin wallet. Next, you log into the Hashi user portal and connect your Sui wallet. The portal will automatically generate a unique, dedicated Bitcoin deposit address that is cryptographically linked only to your Sui account. You then send your native Bitcoin to this address.

Once the transaction receives enough confirmations on the Bitcoin network, the validators will generate your collateral certificate, which will appear as a digital object in your Sui wallet. You can then head over to an integrated lending app like Navi or Scallop, deposit the certificate, and borrow the desired amount of stablecoins. When you want to retrieve your original Bitcoin, you simply repay the borrowed loan amount plus any accumulated interest. The smart contract burns the certificate and releases your Bitcoin back to your original wallet address.

Final Thoughts

The launch of the global testnet in July 2026 represents a major leap forward for decentralized finance. By turning dormant Bitcoin into active collateral without relying on centralized intermediaries, the Hashi framework bridges the gap between the security of the oldest blockchain and the speed of the newest. For the average investor, this means the ability to access institutional-grade lending tools directly from their own wallet, transforming how we view long-term asset storage.

The cryptocurrency market remains highly volatile. This article is for informational purposes only and does not constitute financial advice.