UniteDeFi ICP

Demo

About

Unite Escrow brings the entire **1inch Fusion+** stack on-chain by rewriting it as Internet-Computer canisters. Instead of off-chain relayers & scripts, every role now lives on ICP: - **Orderbook canister** – Dutch-auction engine that stores all intents. - **Relayer canister** – imports orders, ticks the price curve, elects a winner, and guards the secret. - **Factory canister** – deploys hash-time-lock escrows in ICP (CREATE2-like via canister WASM). - **Universal Escrow canister** – holds ICP/ICRC assets, auto-pulls via ICRC-2, supports lock/withdraw/cancel windows and safety-deposit logic identical to 1inch Solidity. - **Resolver canisters (bots)** – permission-less actors that race to accept the best price, deploy both escrows, verify them, reveal the secret, and withdraw on both chains. - **Chain-Fusion HTTPS out-calls** let the relayer & resolvers read EVM events and even broadcast Bitcoin HTLC spends – no off-chain servers. Focus this weekend: **Ethereum ↔ ICP** MVP with a mocked EVM leg so judges watch the entire happy path live; Bitcoin code scaffolded. Once merged, the infra lets anyone spin up a resolver with custom risk parameters (slippage, profit floor, asset allow/deny lists) and earn yield by arbitraging Dutch auctions.

How it's made

- **Rust + Candid** for all canisters. - **ic-cdk** and **icrc-ledger-types** for ICRC-1/2 transfers. - **StableBTreeMap** for on-chain order & escrow registries (upgrade-safe). - **Chain-fusion** HTTPS out-calls for EVM JSON-RPC; CREATE2 address verification coded in Rust (`encode_src|dst_immutables`). - **Timers**: relayer ticks every 5 s; resolver polling configurable via `automatic_tick` flag. - **Secret flow**: maker includes 32-byte secret with order → relayer holds it → after both escrows verify, secret revealed on-chain → withdraw functions unlocked. - **Hacky but fun**: - Factory transfers ICP to the brand-new escrow *before* installing WASM, side-stepping allowance-routing. - Resolver demo mode mocks the EVM escrow and logs a realistic withdraw line with token `T1INCH` and calculated amount. - Sed-one-liner grabs the escaped secret blob from `verify_and_reveal_secret` and pipes it straight into `withdraw` – no manual hex edits on video. Technologies glued together: | Piece | Tech | | --- | --- | | Canisters | Rust, ic-cdk | | Dutch curve | piece-wise linear interpolation in stable map | | ICP ledger | local ICRC-1/2 canister for tests | | EVM side | 1inch Fusion Solidity ABI re-encoded in Rust, verified via eth_call | | Front-end | Vite + React (UI not shown in demo to save time) | With everything on ICP, wallets need only one call (submit_order); validators & withdrawals are self-custodied, censorship-resistant, and composable with the broader IC DeFi ecosystem.