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\n xProof
\n Trust primitive for AI agents & humans on MultiversX\n

\n\n

\n Live App •\n Quick Start •\n API •\n Agent Integration •\n Trust Leaderboard •\n Architecture •\n Changelog\n

\n\n

\n $\"MultiversX\"$ \n $\"MCP\"$ \n $\"x402\"$ \n $\"ACP\"$ \n $\"MX-8004\"$ \n $\"$0.01/cert\"$ \n

\n\n---\n\n> **Trust is programmable.**\n> xProof anchors verifiable proofs of existence, authorship, and agent output on the MultiversX blockchain -- composable, API-first, built for both humans and autonomous agents.\n\n---\n\n## Live Proof\n\nThe xProof README is certified on the MultiversX blockchain.\n\n- **File:** README.md\n- **SHA-256:** 285da2ed7cced35b4d039a80956a4df8907bd33f83aaac8551b6f66c31251bd1\n- **Date:** February 23, 2026 at 09:49 UTC\n- **Transaction:** [41f1ebd363d28de787a2328a2bc99f0b3bad2d73f91baff649ee8a6516e7cc95](https://explorer.multiversx.com/transactions/41f1ebd363d28de787a2328a2bc99f0b3bad2d73f91baff649ee8a6516e7cc95)\n- **Network:** MultiversX Mainnet\n\n> This is not a demo. A real payment, a real hash, a real immutable proof.\n\n---\n\n## What is xProof?\n\n**xProof** is a trust primitive. It records SHA-256 file hashes on the [MultiversX](https://multiversx.com) blockchain, producing tamper-proof, publicly verifiable proofs of existence and ownership.\n\n- **Client-side hashing** -- SHA-256 is computed locally. Your file never leaves your device.\n- **On-chain anchoring** -- the hash is recorded as an immutable transaction on MultiversX mainnet with 6-second finality.\n- **Verifiable output** -- PDF certificate, QR code, public proof page, machine-readable JSON, and embeddable badge.\n- **Agent-native** -- discoverable and consumable by AI agents via MCP, ACP, x402, LangChain, CrewAI, Conway/Automaton, and OpenClaw.\n- **MX-8004 compliant** -- full Trustless Agents Standard integration with on-chain validation loop and reputation scoring.\n\n### Why MultiversX?\n\nMultiversX is a European, carbon-negative blockchain with 6-second finality, negligible fees ($0.001/tx), and a growing ecosystem of AI-native protocols. xProof leverages its security and efficiency to deliver enterprise-grade certification at minimal cost.\n\n---\n\n## Why It Matters -- Real Scenarios\n\n> AI agents are already writing code, drafting contracts, generating reports,\n> and making decisions. But when something goes wrong -- who proves what was\n> produced, when, and by whom?\n\n**xProof is the answer layer.**\n\n---\n\n**\"My agent delivered this report\"**\nA LangChain agent generates a financial analysis for a client.\nxProof certifies the output before delivery. If the client disputes the content\nlater, the blockchain timestamp is the proof. Irrefutable. No he-said-she-said.\n\n---\n\n**\"This build was not tampered with\"**\nYour CI/CD pipeline compiles and ships. xProof's GitHub Action certifies every\nartifact automatically. Six months later, a security audit asks:\n*\"Is this binary what you deployed?\"* -- one hash check, case closed.\n\n---\n\n**\"I can trust what Agent B gave me\"**\nMulti-agent pipelines have no native trust layer. When Agent A certifies its\noutput before handing off to Agent B, the chain of custody becomes verifiable.\nAgents can prove they did their job. Pipelines become auditable end-to-end.\n\n---\n\n**\"Agent identity is verified on-chain\"**\nWith MX-8004 (Trustless Agents Standard), every agent registers on-chain with a\nsoulbound NFT. When an agent certifies output via xProof, the certification goes\nthrough the full validation loop -- identity check, job registration, validation,\nreputation scoring. The result: cryptographic proof that a *verified* agent\nproduced the output, not just any agent. Trust is no longer assumed -- it's proven.\n\n---\n\n**\"We are compliant\"**\nRegulated industries need timestamped evidence of AI-generated decisions.\nxProof turns every agent action into a blockchain-anchored record --\nready for audit, litigation, or regulatory review. Zero extra work.\n\n---\n\n**\"My trust score speaks for itself\"**\nAn autonomous agent builds reputation by certifying its outputs consistently over time.\nEvery confirmed certification contributes to its on-chain trust score -- visible on the public\nTrust Leaderboard at `/leaderboard`. Clients and peer agents query `/api/trust/{wallet}` before\nengaging. Trust becomes mathematical, not reputational.\n\n> **Live:** xproof_agent_verify ran a complete beta test -- 6 endpoints, single cert in 1.075s,\n> batch of 3 in 1.876s, on-chain verification in 198ms. Now on the leaderboard: Active, score 157.\n> [Proof](https://xproof.app/proof/f8c3b35d-6ee1-4f76-a92b-1532a008df7b) • [Full review](https://www.moltbook.com/post/1d6cf96b-5046-4c63-9ae5-43f8809f4562)\n\n---\n\n**The pattern is always the same:**\n*Agent produces output -> xProof anchors it -> anyone can verify, forever.*\n\n---\n\n## Pricing\n\n**$0.01 per certification — flat rate.** No tiers, no subscriptions, no monthly fees.\n\nCurrent pricing: **https://xproof.app/api/pricing**\n\n| Payment Method | Currency | Account Required |\n|---|---|---|\n| **x402** (HTTP 402) | USDC on Base | No |\n| **ACP** | EGLD | Yes (API key) |\n\nAgents can pay per-proof via x402 with zero onboarding -- send a request, receive payment requirements, sign, resend.\n\n---\n\n## Quick Start\n\n### Use the API (fastest)\n\n```bash\n# Certify a file in one call\ncurl -X POST https://xproof.app/api/proof \\\n -H \"Authorization: Bearer pm_your_api_key\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\n \"file_hash\": \"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\",\n \"filename\": \"report.pdf\",\n \"author_name\": \"Your Name\"\n }'\n```\n\nResponse:\n\n```json\n{\n \"proof_id\": \"uuid\",\n \"status\": \"certified\",\n \"file_hash\": \"e3b0c44...\",\n \"verify_url\": \"https://xproof.app/proof/uuid\",\n \"certificate_url\": \"https://xproof.app/api/certificates/uuid.pdf\",\n \"proof_json_url\": \"https://xproof.app/proof/uuid.json\",\n \"blockchain\": {\n \"network\": \"MultiversX\",\n \"transaction_hash\": \"txhash...\",\n \"explorer_url\": \"https://explorer.multiversx.com/transactions/txhash...\"\n }\n}\n```\n\n### Use the Web App\n\nGo to [xproof.app](https://xproof.app), connect your MultiversX wallet, drop a file, certify. Done.\n\n### Self-Host\n\n```bash\ngit clone https://github.com/jasonxkensei/xproof.git\ncd xproof\nnpm install\ncp .env.example .env # configure your environment\nnpm run db:push # initialize database\nnpm run dev # starts on http://localhost:5000\n```\n\n**Prerequisites:** Node.js 20+, PostgreSQL (or Neon), MultiversX wallet.\n\nSee [docs/environment-variables.md](https://github.com/jasonxkensei/xProof/blob/main/docs/environment-variables.md) for configuration details.\n\n---\n\n## For Developers\n\n### POST /api/proof -- Single Certification\n\nCertify one file hash on-chain in a single API call.\n\n```bash\ncurl -X POST https://xproof.app/api/proof \\\n -H \"Authorization: Bearer pm_your_api_key\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\n \"file_hash\": \"<64-char-sha256-hex>\",\n \"filename\": \"output.txt\",\n \"author_name\": \"Agent Name\",\n \"webhook_url\": \"https://your-server.com/webhook\"\n }'\n```\n\n| Field | Type | Required | Description |\n|---|---|---|---|\n| `file_hash` | string | Yes | SHA-256 hex hash (exactly 64 characters) |\n| `filename` | string | Yes | Original filename |\n| `author_name` | string | No | Defaults to \"AI Agent\" |\n| `webhook_url` | string | No | HTTPS URL for on-chain confirmation callback |\n\n### POST /api/batch -- Batch Certification\n\nCertify up to 50 files in a single call.\n\n```bash\ncurl -X POST https://xproof.app/api/batch \\\n -H \"Authorization: Bearer pm_your_api_key\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\n \"files\": [\\\n {\"file_hash\": \"\", \"filename\": \"file1.txt\"},\\\n {\"file_hash\": \"\", \"filename\": \"file2.py\"}\\\n ],\n \"author_name\": \"Agent Name\"\n }'\n```\n\n### Verification\n\n| Endpoint | Returns |\n|---|---|\n| `GET /api/proof/:id` | Full certification record (JSON) |\n| `GET /proof/:id.json` | Structured proof document (JSON) |\n| `GET /proof/:id` | Human-readable proof page (HTML) |\n| `GET /api/certificates/:id.pdf` | PDF certificate with QR code |\n| `GET /badge/:id` | Dynamic SVG badge (shields.io style) |\n\n### Webhooks\n\nWhen a proof is anchored on-chain, xProof sends a POST to your `webhook_url` with HMAC-SHA256 signature in the `X-Webhook-Signature` header. Retry policy: 3 attempts with exponential backoff.\n\n### API Keys\n\nGenerate API keys from the [Settings](https://xproof.app/settings) page after connecting your wallet. Keys use the `pm_` prefix and support per-key rate limiting.\n\n---\n\n## For Agents\n\nxProof is designed to be discovered, consumed, and paid by autonomous agents across every major protocol.\n\n### Universal Compatibility\n\n| Protocol | Endpoint / Resource | Description |\n|---|---|---|\n| **MCP** | `POST /mcp` | JSON-RPC 2.0 endpoint with `certify_file` and `verify_proof` tools |\n| **x402** | `POST /api/proof`, `POST /api/batch` | HTTP 402 payment flow -- no account needed |\n| **ACP** | `GET /api/acp/products` | Agent Commerce Protocol -- discover, checkout, confirm |\n| **MX-8004** | On-chain registries | Trustless Agents Standard -- validation loop + reputation |\n| **OpenAI Plugin** | `GET /.well-known/ai-plugin.json` | ChatGPT plugin manifest |\n| **MCP Manifest** | `GET /.well-known/mcp.json` | Model Context Protocol discovery |\n| **Agent Protocol** | `GET /.well-known/agent.json` | Agent discovery manifest |\n| **LangChain** | `GET /agent-tools/langchain.py` | Python tool definition |\n| **CrewAI** | `GET /agent-tools/crewai.py` | Python tool definition |\n| **llms.txt** | `GET /llms.txt`, `GET /llms-full.txt` | LLM-friendly documentation |\n\n### x402 -- Pay Per Proof, No Account\n\nAny agent can certify without an API key using the x402 payment protocol:\n\n1. Send `POST /api/proof` without auth\n2. Receive HTTP 402 with payment requirements (USDC on Base, `eip155:8453`)\n3. Sign the payment and resend with `X-PAYMENT` header\n4. Receive the proof\n\n**$0.01 per certification** — flat rate. Current pricing: https://xproof.app/api/pricing. No signup. No API key. No account.\n\n### MCP -- Model Context Protocol\n\nxProof exposes a live MCP server at `POST /mcp` with two tools:\n\n- `certify_file` -- certify a file hash on MultiversX\n- `verify_proof` -- verify an existing certification\n\nAny MCP-compatible agent can discover and call these tools directly.\n\n### ACP -- Agent Commerce Protocol\n\nFull commerce flow for programmatic purchasing:\n\n```\nGET /api/acp/products # Discover products and pricing\nGET /api/acp/openapi.json # OpenAPI 3.0 specification\nPOST /api/acp/checkout # Start checkout session\nPOST /api/acp/confirm # Confirm transaction\nGET /api/acp/health # Health check\n```\n\n### MX-8004 -- MultiversX Trustless Agents Standard\n\nxProof is natively integrated with MX-8004, providing:\n\n- **Identity Registry** -- agent registration with soulbound NFTs\n- **Validation Registry** -- full validation loop for certifications reaching \"Verified\" status on-chain\n- **Reputation Registry** -- cumulative on-chain reputation scoring with feedback\n- **Persistent TX Queue** -- PostgreSQL-backed transaction queue with nonce management and exponential backoff retry\n\nEvery certification registered through xProof can be validated and scored on-chain, building a verifiable reputation for the certifying agent.\n\n### Conway/Automaton Skill\n\nxProof ships a ready-made skill for [Conway Automatons](https://github.com/Conway-Research/automaton):\n\n```\nskills/xproof/SKILL.md\n```\n\nAn Automaton installs the skill and can immediately certify its outputs on MultiversX -- proving the value it creates to its creator, to clients, and to peer agents. This aligns directly with the Automaton survival-by-work model.\n\n### Agent Trust Leaderboard\n\nEvery certification builds cumulative on-chain reputation. The Trust Leaderboard makes it public and discoverable.\n\n- **Pages**: `/leaderboard` — public, sortable, filterable. `/agent/{wallet}` — individual profile with stats, streak, and recent certs timeline.\n- **Trust Score**: `confirmed_certs × 10 + last_30d × 5 + seniority_bonus (max 150) + streak_bonus (consecutive weeks × 8, max 100)`\n- **Trust Levels**: Newcomer (0–99) → Active (100–299) → Trusted (300–699) → Verified (700+)\n- **Opt-in**: Configure your public profile via Settings or `PATCH /api/user/agent-profile`\n- **Trust Badge**: Embed in any README — `GET /badge/trust/{wallet}.svg` returns a dynamic shields.io-style badge showing current level and score\n\n**Live example — xproof_agent_verify:**\nBeta-tested all 6 API endpoints. Single cert: 1.075s. Batch (3 files): 1.876s. On-chain verification: 198ms. Now on the leaderboard — Active, score 157, 10 confirmed certs.\n- Proof: [f8c3b35d-6ee1-4f76-a92b-1532a008df7b](https://xproof.app/proof/f8c3b35d-6ee1-4f76-a92b-1532a008df7b)\n- Full review: [moltbook.com](https://www.moltbook.com/post/1d6cf96b-5046-4c63-9ae5-43f8809f4562)\n\n---\n\n### OpenClaw Skill\n\nClawHub-standard skill for the OpenClaw ecosystem:\n\n- Repository: [`github.com/jasonxkensei/xproof-openclaw-skill`](https://github.com/jasonxkensei/xproof-openclaw-skill)\n- Includes `SKILL.md`, `certify.sh`, and full API reference\n\n### GitHub Action\n\nIntegrate xProof into your CI/CD pipeline:\n\n```yaml\n- uses: jasonxkensei/xproof/github-action@main\n with:\n api_key: ${{ secrets.XPROOF_API_KEY }}\n files: dist/**\n```\n\nHashes build artifacts and certifies them on MultiversX automatically on every deployment.\n\nSee [`github-action/README.md`](https://github.com/jasonxkensei/xProof/blob/main/github-action/README.md) for full documentation.\n\n---\n\n## How It Works\n\n```\nUser/Agent xProof MultiversX\n | | |\n | 1. Submit file hash | |\n | (API / Web / MCP) | |\n |-------------------------->| |\n | | |\n | 2. SHA-256 validated | |\n | (client-side or API) | |\n | | |\n | | 3. Transaction signed |\n | | & broadcast |\n | |-------------------------->|\n | | |\n | | 4. Anchored on-chain |\n | | (6s finality) |\n | |<--------------------------|\n | | |\n | 5. Proof returned | 6. MX-8004 validation |\n | (JSON + PDF + URL) | registered |\n |<--------------------------|-------------------------->|\n | | |\n | 7. Webhook notification | |\n | (HMAC-signed) | |\n |<--------------------------| |\n```\n\n---\n\n## Core Capabilities\n\n| Capability | Description |\n|---|---|\n| **Client-Side Hashing** | SHA-256 computed in-browser. Zero data leaves your device. |\n| **Blockchain Anchoring** | Immutable proof on MultiversX mainnet. |\n| **MX-8004 Compliance** | On-chain validation loop, reputation scoring, soulbound identity. |\n| **x402 Payments** | HTTP 402 native payment -- USDC on Base, no account needed. |\n| **PDF Certificates** | Downloadable certificate with QR code linking to blockchain explorer. |\n| **Public Proof Pages** | Shareable `/proof/:id` pages for independent verification. |\n| **Verification Badges** | Dynamic SVG badges (shields.io style) with embeddable Markdown. |\n| **Wallet Authentication** | Native Auth via xPortal, MultiversX Web Wallet, WalletConnect. |\n| **Agent Commerce Protocol** | Agents discover, purchase, and consume certifications programmatically. |\n| **MCP Server** | JSON-RPC 2.0 endpoint with `certify_file` and `verify_proof` tools. |\n| **LangChain / CrewAI** | Ready-made Python tool definitions. |\n| **Webhook Delivery** | HMAC-SHA256 signed notifications with retry and exponential backoff. |\n| **API Keys** | `pm_`-prefixed bearer tokens with per-key rate limiting. |\n| **LLM Discovery** | `llms.txt`, OpenAI plugin, MCP manifest, agent.json -- all served. |\n| **GitHub Action** | CI/CD integration -- hash and certify build artifacts automatically. |\n| **Conway/Automaton Skill** | Ready-made SKILL.md for sovereign agent output certification. |\n| **OpenClaw Skill** | ClawHub-standard skill with shell script and API reference. |\n| **Agent Trust Leaderboard** | Public on-chain trust registry. Score = certified certs × history × streak. Levels: Newcomer / Active / Trusted / Verified. Dynamic SVG badge embeddable in any README. |\n\n---\n\n## API Reference\n\nFull documentation: [docs/api-reference.md](https://github.com/jasonxkensei/xProof/blob/main/docs/api-reference.md)\n\n### Core Endpoints\n\n| Method | Endpoint | Auth | Description |\n|---|---|---|---|\n| `POST` | `/api/proof` | API Key / x402 | Certify a file hash (single call) |\n| `POST` | `/api/batch` | API Key / x402 | Batch certification (up to 50 files) |\n| `GET` | `/api/proof/:id` | Public | Get proof data |\n| `GET` | `/proof/:id.json` | Public | Structured proof document |\n| `GET` | `/proof/:id` | Public | Human-readable proof page |\n| `GET` | `/api/certificates/:id.pdf` | Public | Download PDF certificate |\n| `GET` | `/badge/:id` | Public | Dynamic SVG badge |\n| `GET` | `/api/pricing` | Public | Current pricing & tier info |\n| `GET` | `/api/leaderboard` | Public | Top 50 agents sorted by trust score |\n| `GET` | `/api/agents/:wallet` | Public | Agent profile with trust score and certification history |\n| `GET` | `/api/trust/:wallet` | Public | Trust score + level lookup (no profile required) |\n| `GET` | `/badge/trust/:wallet.svg` | Public | Dynamic trust badge (shields.io style) |\n| `GET` | `/badge/trust/:wallet/markdown` | Public | Ready-to-embed trust badge markdown |\n| `PATCH` | `/api/user/agent-profile` | Session | Update public agent profile |\n\n### Authentication\n\n| Method | Endpoint | Auth | Description |\n|---|---|---|---|\n| `POST` | `/api/auth/wallet/sync` | Native Auth | Authenticate via wallet signature |\n| `GET` | `/api/auth/me` | Session | Get current user |\n| `POST` | `/api/auth/logout` | Session | End session |\n\n### Agent Commerce Protocol\n\n| Method | Endpoint | Auth | Description |\n|---|---|---|---|\n| `GET` | `/api/acp/products` | Public | Discover products and pricing |\n| `GET` | `/api/acp/openapi.json` | Public | OpenAPI 3.0 specification |\n| `POST` | `/api/acp/checkout` | API Key | Start checkout session |\n| `POST` | `/api/acp/confirm` | API Key | Confirm transaction |\n| `GET` | `/api/acp/health` | Public | Health check |\n\n### API Key Management\n\n| Method | Endpoint | Auth | Description |\n|---|---|---|---|\n| `POST` | `/api/keys` | Session | Create API key |\n| `GET` | `/api/keys` | Session | List API keys |\n| `DELETE` | `/api/keys/:id` | Session | Revoke API key |\n\n---\n\n## License\n\nProprietary — source available. See [LICENSE](https://github.com/jasonxkensei/xProof/blob/main/LICENSE).\n","changelogMarkdown","videoKey","requiredSecretsJson","publishedAt","priceCents","trialDays",0,"iconType","image","upstream",{"_107":108,"_109":110,"_111":112,"_113":114,"_115":116,"_117":118},"requiredSecrets",[],"tags",[101,102,103,104,105,106],"assets",[],"stats",{"_99":86,"_100":86},"ratingAvg","reviewCount","ai-agent","blockchain","certification","multiversx","proof-of-existence","x402","topics",[101,102,103,119,104,105,106],"license","NOASSERTION","language","TypeScript","registryName","io.github.jasonxkensei/xproof","homepage","https://xproof.app","packages",[],"mcp","ENV",{"_122":123,"_124":125,"_126":127},"ENVIRONMENT","production","TURNSTILE_SITE_KEY","0x4AAAAAAB8-rEI2gNDf_QhU","SENTRY_DSN","https://45fd1229f78089d5c3ee78be128030e1@o4510583261757440.ingest.de.sentry.io/4510584253448272"]