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Sarek CoreQuickstart

Quickstart

Stamp any data and get back a portable, independently verifiable proof.

Requirements

  • TypeScript: Node.js 18 or later
  • Python: Python 3.10 or later

Installation

npm install @sarek/core

Your first stamp

Hashing happens locally with SHA3-256. Only the hash leaves your process; the data itself never does.

import { initSarekCore } from '@sarek/core'
 
const sarek = await initSarekCore()
 
const data = 'Patient 4821: high risk for diabetes'
const proof = await sarek.stamp(data)
 
const result = await sarek.verify(proof.ldgp, data)
// → { valid: true, treeIntegrity: true, onChain: true }

The SDK writes a local record and the proof file to a sarek-core/ directory in your working directory, so every stamp is reproducible later.

Stamp files and batches

import { initSarekCore } from '@sarek/core'
import fs from 'node:fs'
 
const sarek = await initSarekCore()
 
const pdf = fs.readFileSync('invoice-2026-118.pdf')
const proofPdf = await sarek.stamp(pdf)
 
const results = await sarek.stamp([
  'loan #4821 approved',
  'loan #4822 declined',
  'loan #4823 approved'
])
// results.length → 3

A single input returns a single result. A list returns a list, stamped in one transaction.

Next steps

Last updated on
OverviewSDK Reference: TypeScript