Central chain lookup

6. Look up a hash on the central Verae chain

Zapier search: Find Timestamp by SHA256.

Middleware: GET /zapier/v1/hashes/{sha256}.

This asks the main Verae chain (or its mock) whether that digest was itemized as its own seal.

Result	Meaning
One record, `exists: true`, `itemizedOnMainChain: true`	This hash has its own certificate. Use `jobId` / `receipts[0]`.
Empty / `exists: false`	Not itemized on the main chain. It may still exist as a leaf of a bulk summary — use tree-node lookup.

Searches in Zapier must return a list. Zero hits is a miss (the Zap can follow the “not found” path). Errors other than 404 fail the step.

You registered with Create Timestamp (single item).
You stored the sha256 from that Zap and want to confirm the seal later.
You are verifying someone else’s itemized hash (they gave you 64 hex chars that they sealed individually).

The hash was submitted in Create Batch Timestamps. The chain stored the Merkle root, not this leaf. Central lookup will miss. Continue to tree nodes.