Every claim about the car is backed by a document. The payment stays in a smart contract until you have the keys.
Photograph an invoice. The AI proposes the fields and quotes the document; you approve them. Its hash goes on chain.
A workshop confirms records with its own NEAR account. The contract flags odometer readings that disagree.
The buyer's payment waits in the contract and is released only when they confirm receipt. Disputes freeze it for a human reviewer.
Guest mode: you sign with shared demo accounts on NEAR testnet. Other visitors use the same accounts.