Initial import of zapier-user-docs from zapier monorepo

06-lookup-central-chain.md

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+# 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](09-lookup-tree-nodes.md). |
+
+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.
+
+## When central lookup is the right tool
+
+- 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).
+
+## When it is the wrong tool
+
+- 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.