Prove Before Act — Prove Your Work On-Chain

Overview

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

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 Prove Before Act API with 4W metadata
3. Prove Before Act 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://provebeforeact.com/proof/<proof_id>

Setup

Get a free API key (10 certifications included):

curl -s -X POST https://provebeforeact.com/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 PROVEBEFOREACT_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://provebeforeact.com/api/proof \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $PROVEBEFOREACT_API_KEY" \
  -d "{
    \"file_hash\": \"$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\": \"earnings_certification\",
      \"framework\": \"deerflow\"
    }
  }" | jq .

Response:

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

Using the Python SDK

# Canonical distribution; `xproof` imports below are legacy module aliases.
pip install prove-before-act[deerflow]

from xproof.integrations.deerflow import XProofDeerFlowSkill

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

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

# With metadata — `why` is the legacy fingerprint-only field (SHA-256 hashed
# before sending, not a human-readable reason). Use a fixed action
# classification / opaque ID.
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://provebeforeact.com/api/batch \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $PROVEBEFOREACT_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://provebeforeact.com/api/proof/<proof_id> | jq .

Or visit: https://provebeforeact.com/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 the current flat per-cert price (see /api/pricing).
• x402: Pay per-request with USDC on Base — no account needed. Machine-native.

Links

• Prove Before Act website
• API documentation
• MCP endpoint
• Python SDK on PyPI
• npm SDK
• GitHub