langchain-openttt 0.2.0

Proof-of-Time tools for LangChain agents — cryptographic temporal attestation for DeFi transactions and general LLM audit-trail timestamping

OpenTTT LangChain Integration

Problem: DEX swaps get front-run. Your agent can't prove transaction ordering.

Solution: verify_proof_of_time generates cryptographic timestamps from 3+ atomic clock sources (NIST, Google, Apple) and verifies swap ordering on-chain.

Result: Your agent detects MEV attacks in one tool call.

Installation

npm install openttt @langchain/core zod

Quick Start

import { VerifyProofOfTimeTool } from "openttt/integrations/langchain";
import { ChatOpenAI } from "@langchain/openai";
import { createToolCallingAgent, AgentExecutor } from "langchain/agents";
import { ChatPromptTemplate } from "@langchain/core/prompts";

// 1. Create the tool
const potTool = new VerifyProofOfTimeTool();

// 2. Wire into your agent
const llm = new ChatOpenAI({ model: "gpt-4o" });
const prompt = ChatPromptTemplate.fromMessages([
  ["system", "You are a DeFi security agent. Use verify_proof_of_time to check transaction ordering."],
  ["human", "{input}"],
  ["placeholder", "{agent_scratchpad}"],
]);

const agent = createToolCallingAgent({ llm, tools: [potTool], prompt });
const executor = new AgentExecutor({ agent, tools: [potTool] });

// 3. Run
const result = await executor.invoke({
  input: "Verify ordering for tx 0xabc123... on Base (chain 8453) pool 0xdef456...",
});

Tool Details

Field	Value
Name	verify_proof_of_time
Inputs	txHash (string), chainId (number), poolAddress (string)
Output	JSON with verified, proof (timestamp, confidence, sources), sourceReadings

Configuration

// Custom time sources
const tool = new VerifyProofOfTimeTool({
  timeSources: ["nist", "google", "cloudflare"],
});

What the Proof Contains

{
  "verified": true,
  "proof": {
    "timestamp": "1742000000000000000",
    "uncertainty_ms": 2.5,
    "sources": 3,
    "stratum": 1,
    "confidence": 1.0,
    "nonce": "a1b2c3...",
    "expiresAt": "1742000060000",
    "onChainHash": "0x..."
  },
  "sourceReadings": [
    { "source": "nist", "timestamp": "...", "uncertainty_ms": 1.2 },
    { "source": "apple", "timestamp": "...", "uncertainty_ms": 3.1 },
    { "source": "google", "timestamp": "...", "uncertainty_ms": 2.0 }
  ]
}

How It Works

1. Queries 3+ independent atomic clock sources simultaneously
2. Synthesizes a median timestamp with confidence score
3. Self-verifies cross-source consistency (stratum-adaptive tolerance)
4. Applies nonce + expiration for replay protection
5. Computes keccak256 hash for optional on-chain contract verification

Learn More

• IETF Draft: Proof of Time
• OpenTTT SDK
• Yellow Paper