@verifiedstate/langchain

LangChain Stores the Fact. It Doesn't Store the Proof.

VerifiedState integration for LangChain. Adds cryptographic verification receipts to every assertion your LangChain agent makes.

Install

npm install @verifiedstate/langchain

Quick Start

import { VerifiedStateLangchain } from '@verifiedstate/langchain';

const memory = new VerifiedStateLangchain({
  apiKey: 'vs_live_...',
  namespaceId: 'your-namespace-uuid',
});

// Store and verify a fact from your LangChain agent
const { artifact, assertions, receipts } = await memory.storeAndVerify(
  'Customer prefers dark mode and uses PostgreSQL'
);

console.log(receipts[0].status);           // "verified"
console.log(receipts[0].final_confidence); // 0.94

// Query verified memory
const results = await memory.query('What database does the customer use?');
console.log(results.answerable);     // true
console.log(results.channels_used);  // ["sparse", "dense"]

Why

Every fact your LangChain agent stores should come with proof — a signed receipt showing what the claim is, what evidence supports it, and whether it's been challenged or superseded.

Without verification receipts, you have the agent's output. You don't have the reasoning.

API

store(content, sourceId?)

Store content from your LangChain agent.

extract(artifactId)

Extract structured assertions.

verify(assertionId)

Verify an assertion, produce a signed receipt.

storeAndVerify(content, sourceId?)

All-in-one: store, extract, verify.

query(queryText, limit?)

Six-channel retrieval with abstention.

health()

Namespace health metrics.

Links

• Documentation
• Integration Guide
• Get API Key

License

MIT