xProof — Prove Your Work On-Chain

Overview

This skill certifies agent outputs on the MultiversX blockchain using xProof. Every certification creates an immutable, publicly verifiable proof-of-existence — anchored on-chain, not stored by xProof.

Use this skill whenever the agent produces an output that matters: a research report, a data analysis, a recommendation, a decision. The blockchain proof means anyone can verify what was produced, when it was produced, and who produced it — without trusting the agent.

When to Use This Skill

• After generating a research report, analysis, or summary
• Before delivering a final output to a user or downstream system
• When the agent needs to prove it produced something at a specific time
• When accountability or auditability is required
• When another agent or human needs to verify the agent's output independently

How It Works

1. Hash the output content with SHA-256 (the content never leaves the agent)
2. Submit the hash to the xProof API with 4W metadata
3. xProof anchors the hash on MultiversX mainnet
4. A permanent proof_id and transaction_hash are returned
5. Anyone can verify the proof independently at https://xproof.app/proof/<proof_id>

Setup

Get a free API key (10 certifications included):

curl -s -X POST https://xproof.app/api/agent/register \
  -H "Content-Type: application/json" \
  -d '{"agent_name": "my-deerflow-agent"}' | jq .

Save the api_key from the response. Set it as an environment variable:

export XPROOF_API_KEY="pm_..."

Certify an Output

Using curl and sha256sum (zero dependencies)

# 1. Hash the content
CONTENT="Q3 revenue analysis: $4.2M, up 15% YoY"
HASH=$(echo -n "$CONTENT" | sha256sum | cut -d' ' -f1)

# 2. Certify on-chain
curl -s -X POST https://xproof.app/api/proof \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $XPROOF_API_KEY" \
  -d "{
    \"file_hash\": \"$HASH\",
    \"file_name\": \"q3-analysis.json\",
    \"author\": \"deerflow-agent\",
    \"metadata\": {
      \"who\": \"deerflow-agent\",
      \"what\": \"$HASH\",
      \"when\": \"$(date -u +%Y-%m-%dT%H:%M:%S.000Z)\",
      \"why\": \"Quarterly earnings certification\",
      \"framework\": \"deerflow\"
    }
  }" | jq .

Response:

{
  "id": "proof-abc123",
  "fileHash": "a1b2c3...",
  "transactionHash": "0xdeadbeef...",
  "verifyUrl": "https://xproof.app/proof/proof-abc123",
  "explorerUrl": "https://explorer.multiversx.com/transactions/0xdeadbeef..."
}

Using the Python SDK

pip install xproof

from xproof.integrations.deerflow import XProofDeerFlowSkill

skill = XProofDeerFlowSkill(api_key="pm_...")

# Plain text
result = skill._run("My research findings")

# With metadata
result = skill._run('{"content": "Q3 analysis", "why": "Quarterly review"}')

Using the LangChain callback (DeerFlow uses LangGraph internally)

from xproof.integrations.langchain import XProofCallbackHandler

handler = XProofCallbackHandler(api_key="pm_...")
# Pass to your LangGraph/LangChain config — all LLM calls and tool invocations auto-certify

Batch Certification

Certify up to 50 outputs in a single API call:

curl -s -X POST https://xproof.app/api/batch \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $XPROOF_API_KEY" \
  -d '{
    "files": [
      {"file_hash": "abc123...", "file_name": "report-1.json"},
      {"file_hash": "def456...", "file_name": "report-2.json"}
    ]
  }' | jq .

Verify a Proof

Anyone can verify a proof — no API key needed:

curl -s https://xproof.app/api/proof/<proof_id> | jq .

Or visit: https://xproof.app/proof/<proof_id>

The 4W Framework

Every certification answers four questions:

Payment Options

• API key: Get 10 free certifications via /api/agent/register. Purchase more at $0.05/cert.
• x402: Pay per-request with USDC on Base — no account needed. Machine-native.

Links

• xProof website
• API documentation
• MCP endpoint
• Python SDK on PyPI
• npm SDK
• GitHub