Satoshi Flow

SatoshiFlow lets you earn income on Bitcoin without selling it and without handing it to a custodian.

Native BTC bridges to Sui through Hashi, where it becomes hBTC backed by a threshold-signature validator committee rather than a company. You then write a covered call: the vault locks your hBTC one-for-one and mints you a tradeable option token: a real Coin<T>, not a row in a database. You sell that token on a SUI DeepBook order book, and that sale is your premium, paid today.

At expiry the series settles at a single price recorded on chain, with its source recorded beside it. If Bitcoin closed at or below the strike, the option is worthless and you reclaim every satoshi youlocked. If it closed above, the option's intrinsic value is paid out of your collateral to whoever holds the token, and you keep the remainder plus the premium you already banked. That is the payoff of a covered call on any options desk; the difference is that every leg of it is an on-chain object you can inspect.

Everything is fully collateralised. One satoshi locked per unit of exposure, so there is no margin engine, no liquidation bot, and no oracle needed for solvency. The price feed only decides settlement, and settlement itself is permissionless: anyone can trigger it once a series expires, because the caller cannot supply the price.

Satoshi Flow is built on Sui using Hashi and DeepBook. Hashi handles the trust-minimized movement of BTC between the Bitcoin and Sui networks, allowing users to bridge Bitcoin into Sui and later move it back to Bitcoin. Once BTC liquidity is available on Sui, the protocol uses DeepBook to orchestrate and execute the orders required for structured strategies such as covered calls and stablecoin carry.

The application connects the bridging flow, strategy logic, and order execution into a single user experience. Hashi gives the project secure cross-chain Bitcoin connectivity, while DeepBook provides the onchain liquidity and order-book infrastructure needed to manage trades efficiently. One of the more challenging parts was coordinating asynchronous bridge events with strategy execution, ensuring funds were confirmed on Sui before orders were created and tracking the full lifecycle until settlement and withdrawal.