You only commit USDC once you accept an Architect. Until then this commission lives off-chain. After that, every transition is a signed transaction on Arc.
Off-chain. Stored in Quill. No USDC at risk.
Off-chain. Architects pitch. SIWE-verified.
Onchain. USDC moves into ERC-8183 escrow.
Onchain. Architect commits a deliverable hash.
Onchain. USDC releases to Architect on approval.