Agent Framework

LangChain Remembers. VerifiedState Proves.

Your LangChain agent has BaseMemory. But can you prove what it remembered?

The Problem

LangChain's memory classes (ConversationBufferMemory, VectorStoreRetrieverMemory) store and retrieve. When two memories conflict, the latest wins. No receipt. No audit trail. No temporal query.

Agent A stores. Agent B queries. Receipts connect them.

• • • Agent A stores fact

User's budget is $50,000

✓ Stored via BaseMemory · rct_44ef

• • • Agent B queries

> What's the user's budget?

✦ Verified memory lookup

$50,000 · stored by Agent A

Receipt: rct_44ef · confidence 0.97

Drop-in BaseMemory. Now with receipts.

The Fix

npm install @verifiedstate/langchain

typescript
import { VerifiedMemory } from '@verifiedstate/langchain';

const memory = new VerifiedMemory({
  apiKey: 'vs_live_...',
  namespaceId: 'ns_1',
});

// Drop into any LangChain agent as BaseMemory
const agent = new AgentExecutor({
  agent: myAgent,
  tools: myTools,
  memory: memory, // ← verified memory with receipts
});

What You Get Back

✓ VERIFIED

receipt.json
{
  "receipt_id": "rct_7f3a...",
  "assertion": "User prefers dark mode",
  "status": "verified",
  "confidence": 0.94,
  "signature": "ed25519:a8c3f1...",
  "verified_at": "2026-04-06T14:32:01Z",
  "chain_position": 42
}

Without VerifiedState vs. With VerifiedState

Feature	Without	With VerifiedState
Memory conflicts	Latest wins silently	Conflicts detected + flagged
Audit trail	None	Signed receipts
Temporal queries	Not supported	Bitemporal
Governance	None	JSON policy engine

FAQ

Is it a drop-in replacement for BaseMemory?

Yes. VerifiedMemory implements the BaseMemory interface. Swap it in with one line.

Does it work with LCEL chains?

Yes. Works with both legacy chains and LCEL.

Start building with verified memory.

Free: 50,000 assertions/month. No credit card. No trial expiration.

Get Free API Key Read the Docs GitHub →