blip

Blip is an AI-powered, human-verified cross-chain USDC bridge that lets users transfer native USDC between World Chain Sepolia and Base Sepolia by simply typing a natural language request like "Bridge 50 USDC to Base".

The Problem It Solves
Traditional cross-chain bridges suffer from three core problems:

1. Too many steps — Users must manually approve, sign, bridge, wait, and claim across multiple transactions and UIs
2. Wrapped token fragmentation — Most bridges lock tokens and mint wrapped versions (e.g., wUSDC), creating peg risk and liquidity fragmentation
3. Sybil attacks — Bridge incentive programs attract bots; there's no way to ensure only real humans benefit

How It Works (End-to-End)

1. World ID Verification (Human Gate)
   Before doing anything, the user proves they're a real human via World ID 4.0. Inside World App it uses MiniKit (native sheet), in a browser it uses IDKit with RP signatures. The backend records the verified address on-chain via HumanRegistry.sol.
2. AI Intent Parsing
   The user types a plain-language bridge request. The Gemini API parses it, extracting the source chain, destination chain, token, amount, and recipient. A confirmation card is shown before any signing happens.
3. USDC Burn on World Chain
   The user signs a single batched transaction (ERC20 approve + depositForBurn). USDC is destroyed on World Chain — not locked. This is Circle's CCTP V2 burn-and-mint protocol.
4. Attestation via Circle Iris API
   The backend monitors Circle's Iris API, polling for a cryptographic attestation that the burn was observed. Blip uses Fast Transfer mode (minFinalityThreshold ≤ 1000), yielding attestation in ~8 seconds instead of 15–19 minutes.
5. Relay to Base
   Once attested, the backend calls MessageTransmitter.receiveMessage() on Base, which mints native USDC (not wrapped) directly to the recipient.
6. On-Chain Audit Trail + Real-Time Updates
   Every bridge intent is recorded on-chain via BlipTransactionRecorder.sol. The frontend receives live status updates via WebSocket as the relay progresses.

Frontend (Next.js + MiniKit)

• Chat UI sends user's text to Gemini, gets parsed intent (amount, recipient, chains), prompts a single wallet signature
• AuthGate blocks access until World ID is verified
• WebSocket subscription streams live relay status updates
  CRE (Chainlink Runtime Environment)
  Runs the relay automation:

1. Extracts MessageSent bytes from the burn tx receipt
2. Polls Circle Iris API for attestation (~8s with Fast Transfer)
3. Calls MessageTransmitter.receiveMessage() on Base to mint USDC
4. Updates MongoDB + notifies frontend via WebSocket
   Smart Contracts (Foundry, World Chain)

• HumanRegistry — records verified human addresses after World ID proof
• BlipTransactionRecorder — on-chain audit trail for every bridge intent
  Bridge Protocol (Circle CCTP V2)
  User signs one tx (depositForBurn) → USDC burned on World Chain → attested by Circle → native USDC minted on Base. No liquidity pools, no wrapped tokens.
  AI (Gemini)
  Parses plain-language input into structured bridge parameters so users never touch a traditional bridge UI.