Verify a settled transfer against the destination chain (not against our database)

Every relay answers "did it work?" by reading its own row and saying yes — a relay that has mis-delivered has a database that still says DONE. This checks the DESTINATION CHAIN: it fetches the payout transaction, decodes its ERC-20 Transfer logs, and reports what actually happened. You supply the post-conditions (recipient, minAmount) and we tell you whether reality matches. It also cross-checks our own receipt against the chain and will say so, in plain terms, if our books disagree. THREE-VALUED: verified | failed | undetermined. undetermined (chain unreachable, tx not yet mined, unknown id) is NOT a pass — collapsing "could not check" into "fine" is how a loss gets reported as a success. The response includes the destination tx hash so you can reproduce the whole result yourself without trusting us. COVERS EVERY RAIL, and is candid about the ones it cannot re-derive: Allbridge, Chainflip, Solana and Tron settlements record completion as an observed BALANCE DELTA rather than a transaction we can fetch and decode, and non-EVM destinations are not reachable via EVM JSON-RPC. Those return undetermined with the reason stated — never verified on the strength of a database row. For non-EVM destinations it now QUERIES the chain and returns a balanceObservation (live balance vs recorded baseline plus delivered amount). That observation is reported alongside the verdict and never replaces it: a balance cannot prove a specific transfer, because tokens are fungible and recipients spend them, so the verdict stays undetermined.