Sui said Thursday its Hashi bitcoin-collateral system moves to mainnet this month with more than $500 million in committed capital. The announcement landed at Sui Basecamp in Singapore.
Hashi keeps bitcoin on the Bitcoin network and lets Sui applications treat it as collateral. Deposits mint hBTC, a Sui-side token holding a claim on native bitcoin. Withdrawals burn hBTC and release the underlying coins back on Bitcoin.
Adeniyi Abiodun, co-founder and chief product officer at Mysten Labs, framed what the project is trying to do.
“Bitcoin has already become a global reserve asset, and today, the financial infrastructure around it is catching up,” Abiodun said in the launch note.
He argued every major asset class builds credit, lending and liquidity markets over time, and bitcoin has not yet done so onchain.
The committed capital sits with a launch coalition of more than 20 firms. BitGo, Bullish, FalconX, Cumberland and Ledger have backed the project since earlier in 2026. Anchorage Digital joins as a day-one partner, bringing two routes for institutional money.
One route uses Atlas, Anchorage’s tri-party settlement infrastructure operating inside qualified custody, aimed at public companies and digital-asset treasuries that need compliance wrappers. The other uses Porto, its institutional self-custody wallet, for hedge funds, crypto funds, miners, market makers and liquidity providers willing to self-manage. Anchorage also plans to supply stablecoin liquidity to Hashi.
“Connecting our institutional clients with Hashi represents a complete paradigm shift and maturation of bitcoin finance,” Anchorage Digital CEO Nathan McCauley said in the same note.
What Hashi actually does at launch
Vault providers such as Aftermath, Concrete and Fluid are expected to run the first bitcoin-backed markets. The Sui Foundation says those vaults could support lending, borrowing, credit, structured products and real-world asset exposure from day one.
Earlier project notes also named Erebor Bank, Inveniam Capital and CF Benchmarks among ecosystem partners, alongside Sui-native lending protocols including AlphaLend, Navi, Scallop and Suilend.
Sui points to idle capital as the reason this matters. More than $1 trillion in bitcoin sits largely dormant in institutional wallets, public companies and exchange holdings that cannot easily use it as collateral on a different chain. Hashi tries to make that balance productive without forcing a sale.
A holder deposits native bitcoin into a Hashi-generated address, Sui validators confirm the transaction and mint hBTC, and the underlying coins stay where they were. That means a public company holding bitcoin on its balance sheet could borrow against it without moving custody or triggering a taxable sale, depending on jurisdiction and accounting treatment.
Borrowers mint hBTC against BTC collateral and can draw stablecoin liquidity instead of dumping bitcoin.
Security, and the limits of the story
Deposits rest on a 2-of-2 multisig structure: an MPC signature from Hashi validators plus a separate signature from a guardian running an additional policy layer. Sui calls this the Guardian Layer. It can slow or block unusual or oversized transfers before collateral leaves the system.
Sui says the design differs from wrapped-bitcoin models where a custodian or issuer holds the underlying coins and mints a token on another chain, leaving holders exposed to a single point of failure. Hashi adds MPC and a guardian so no single party can move collateral alone.
Certora has formally verified the smart contracts. CommonPrefix reviewed the network’s MPC cryptography. Sui acknowledges those reviews do not erase smart-contract, custody or operational risk.
One practical tradeoff is the withdrawal limiter. It slows an attacker who tries to drain a vault, but it can also slow legitimate withdrawals during market stress, exactly when users most want access to their coins. Whether that feels acceptable to traders is a question the mainnet rollout answers.
There is another tradeoff worth naming. The $500 million figure is committed capital, not funds already locked in Hashi contracts, and Sui has not claimed otherwise. Mainnet opens in phases, so the effective day-one liquidity is likely well below that number and likely grows with each partner integration.
What signals real traction
Three markers will show whether Hashi does what its pitch claims. The first is deposits.
Actual BTC flowing in will settle whether committed capital converts into live collateral.
The second is hBTC minted on Sui. That shows adoption at the application layer rather than in one-way wallet transfers.
The third is what named partners finish first. Custodians and trading firms that complete integrations and route client flows decide how much of the committed capital actually hits mainnet liquidity.
Institutions that hold bitcoin do not automatically want to finance it on a newer chain, even with a familiar custodian in the middle. Some will test the Atlas path because it mirrors tri-party collateral arrangements they already know. Others will use Porto and self-custody directly on Sui.
Hashi started as a Sui Foundation project earlier in 2026. Mysten Labs built the core infrastructure. Testnet went live July 22, 2026, and the mainnet announcement arrives less than three months later.
One useful precedent: Hashi’s testnet bridged an early test wave. Onchain trackers counted more than 1.1 million deposits and 165,000 withdrawals in the first three weeks after testnet opened on July 22, per data cited by Bitcoin.com News. Those were test-network figures, not mainnet capital, but they hint retail and institutional teams were already rehearsing flows before the launch.
What actually moves the market narrow down to who puts money onchain first, and how badly it holds up under stress. If a custody partner flips the switch and real BTC lands inside Hashi vaults, committed capital becomes deposited capital, and the product earns the institutional label Sui has attached to it. If integrations stall or a withdrawal delay bites during a volatility spike, the pitch cools fast.
For now, Sui has a calendar, a coalition and a number to defend. The rest of October tells whether it holds.