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docs/modules/verae-tree-node/merkle.md

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+# `verae-tree-node/merkle`
+
+**Package:** `verae-tree-node`  
+**Source:** `packages/verae-tree-node/src/merkle.js`  
+**Lines:** 97
+
+## What this module is
+
+Implementation module in `verae-tree-node`. The tables below are extracted from the source (signatures + JSDoc).
+
+## Exports
+
+`sha256Hex`, `parentHash`, `buildMerkle`, `merkleProof`, `verifyProof`, `shardIndex`
+
+## Types / interfaces / classes
+
+_None extracted._
+
+## Functions
+
+| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
+|------|------------|---------------------|---------|-----------------------------|
+| `sha256Hex` | `data` | data: `string|Buffer|Uint8Array` | `string` — lowercase hex | see Call graph |
+| `parentHash` | `left, right` | left: `string`, right: `string` | `unknown` | see Call graph |
+| `buildMerkle` | `leaves` | leaves: `string[]` | `{ root: string, layers: string[][], leaves: string[] ` — } | see Call graph |
+| `merkleProof` | `layers, index` | layers: `string[][]`, index: `number` | `Array<{ sibling: string, position: 'left'|'right' ` — >} | see Call graph |
+| `verifyProof` | `leaf, proof, root` | leaf: `string`, root: `string` | `unknown` | see Call graph |
+| `shardIndex` | `sha256, n` | sha256: `string`, n: `number` | `unknown` | see Call graph |
+
+## What it imports / requires
+
+- `node:crypto`
+
+## Call graph (identifiers invoked)
+
+`sha256Hex`, `isBuffer`, `from`, `createHash`, `update`, `digest`, `children`, `duplicated`, `parentHash`, `buildMerkle`, `map`, `toLowerCase`, `push`, `merkleProof`, `floor`, `verifyProof`, `nodes`, `shardIndex`, `slice`, `readUInt32BE`
+
+Each identifier is a call site in this file. Follow the import list to see the defining module; open that module’s MD for parameter and return types.
+
+## Return values (how to read this)
+
+- HTTP route handlers return Express `res.json(...)` bodies (see route docs).
+- Zapier `perform` functions return a **single object** (creates) or an **array** (triggers/searches).
+- Pricing functions return integer **cents** on `Quote.totalCents`.
+