# `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`.