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Cryptographically anchor documents to Solana.","maintainers":[{"name":"sipheron-arcs","email":"admin@sipheron.com"}],"readme":"<p align=\"center\">\n  <img src=\"https://raw.githubusercontent.com/SipHeron-VDR/vdr-core/master/sipheron_vdap_logo.png\" alt=\"SipHeron VDR Logo\" width=\"350\" />\n</p>\n\n# SipHeron VDR Core\n\n[![NPM Version](https://img.shields.io/npm/v/@sipheron/vdr-core?color=blue&style=flat-square)](https://www.npmjs.com/package/@sipheron/vdr-core)\n[![License](https://img.shields.io/npm/l/@sipheron/vdr-core?style=flat-square)](https://github.com/SipHeron-VDR/vdr-core/blob/master/LICENSE)\n[![TypeScript](https://img.shields.io/badge/TypeScript-Ready-blue?style=flat-square)](https://www.typescriptlang.org/)\n[![Node.js](https://img.shields.io/badge/Node.js-%3E%3D18.0.0-green?style=flat-square)](https://nodejs.org/)\n\n**The Cryptographic Engine of SipHeron VDR.**\n\nSipHeron VDR is a completely decentralized protocol for permanently notarizing documents to the Solana blockchain. `@sipheron/vdr-core` is the independent, foundational SDK that allows developers to interact with the SipHeron smart contract on Solana — either fully independently (no API key required) or via the managed SipHeron SaaS platform.\n\n***\n\n## What is SipHeron VDR Core?\n\nSipHeron is built on the philosophy of **true, autonomous cryptographic independence**. Any sophisticated buyer or external auditor can view the open-source implementation in `vdr-core` and verify our zero-knowledge architecture.\n\n- **Privacy First (Local Hashing)**: Documents are hashed client-side (in-browser or Node.js). The raw file bytes *never* leave your machine.\n- **Dual Architecture**: Choose between `DIRECT` (talk directly to Solana RPC nodes using your own wallet) or `HOSTED` (use the SipHeron API for convenience, dashboards, and advanced features).\n- **Streaming Hashes**: Built-in support for hashing massive files in chunks without blowing up your RAM.\n- **Soft Revocation Registry**: Mark documents as officially superseded or revoked without deleting the immutable blockchain record.\n- **Webhook Security Toolkit**: Cryptographically verify HMAC signatures for backend infrastructure hooks with built-in replay attack prevention.\n- **Integrity Reports**: Programmatically generate audit-ready PDF reports aggregating proof of documents.\n\n---\n\n## Installation\n\nInstall `@sipheron/vdr-core` via npm:\n\n```bash\nnpm install @sipheron/vdr-core\n```\n\nIf you plan on utilizing the **Direct On-Chain** functions and talking to the blockchain directly, you will also need to install `@solana/web3.js` as a peer dependency:\n\n```bash\nnpm install @solana/web3.js\n```\n\n---\n\n## Quick Tour\n\nThe library is designed to be extremely intuitive whether you're using our hosted APIs or opting for the direct integration.\n\n### Method 1: Hosted Platform (SipHeron Client)\nFor developers integrating the SaaS workflow (generating PDF Certificates, maintaining managed analytics dashboards, fetching compliance logs). *Requires a SipHeron API Key (except on devnet placeholder routes).*\n\n```typescript\nimport { SipHeron } from '@sipheron/vdr-core'\nimport { readFileSync } from 'fs'\n\n// 1. Initialize client\nconst sipheron = new SipHeron({\n  apiKey: process.env.SIPHERON_API_KEY,  // Required for mainnet\n  network: 'mainnet'                     // or 'devnet'\n})\n\nconst documentBuffer = readFileSync('./legal-contract.pdf')\n\n// 2. Anchor a document \n// The SDK hashes the file LOCALLY, then transmits only the 64-char hash.\nconst record = await sipheron.anchor({\n  file: documentBuffer, \n  name: 'Employment Verification' \n})\nconsole.log('Document anchored at:', record.timestamp)\nconsole.log('Certificate URL:', record.verificationUrl)\n\n// 3. Verify a document's authenticity\nconst verification = await sipheron.verify({ file: documentBuffer })\n\nif (verification.authentic) {\n  console.log('Valid! Anchored at:', verification.verifiedAt)\n} else if (verification.status === 'revoked') {\n  console.warn('Document is perfectly intact, but has been SUPERSEDED!')\n  console.warn('Reason:', verification.revocation?.reason)\n} else {\n  console.error('TAMPERED OR UNKNOWN DOCUMENT')\n}\n\n// 4. Record Soft Revocation (Compliance)\n// Mark an anchor as superseded without destroying the cryptographic truth.\nawait sipheron.anchors.revoke(record.id, {\n  reason: 'superseded',\n  note: 'Replaced by NextGen Amendment V2',\n  supersededByAnchorId: 'anc_NEW_ID_HERE'\n})\n```\n\n### Method 2: Direct, On-Chain Usage (Open Source)\nNo API keys, no monthly fees (beyond Solana gas), no dashboard. You authorize transactions with your own wallet directly against the smart contract.\n\n**A. Generate local fingerprints:**\n```typescript\nimport { hashDocument } from '@sipheron/vdr-core'\n\n// Everything is hashed locally.\nconst documentHash = await hashDocument(fileBuffer, { algorithm: 'sha256' })\n```\n\n**B. Write directly to Solana:**\n```typescript\nimport { anchorToSolana } from '@sipheron/vdr-core'\nimport { Keypair } from '@solana/web3.js'\n\nconst issuerKeypair = Keypair.fromSecretKey(...) // Load your local wallet\n\nconst result = await anchorToSolana({\n  hash: documentHash,\n  keypair: issuerKeypair,\n  network: 'mainnet',\n  metadata: 'My Private Contract v1.2' \n})\n\nconsole.log('Record PDA Address:', result.pda)\nconsole.log('Solana Transaction:', result.explorerUrl)\n```\n\n**C. Direct On-Chain Verification:**\nLook up your anchor explicitly parsing the Program Data Accounts from an RPC node.\n```typescript\nimport { verifyOnChain } from '@sipheron/vdr-core'\n\nconst check = await verifyOnChain({\n  hash: documentHash,\n  network: 'mainnet',\n  ownerPublicKey: issuerKeypair.publicKey\n})\n\nconsole.log('Authentic:', check.authentic) // true if hash matches and not revoked\n```\n\n---\n\n## Handling Large Files (Streaming)\n\nSometimes documents are too large (like 5GB uncompressed datasets) to buffer into RAM safely. VDR Core exposes streaming APIs:\n\n```typescript\nimport { hashFileStream } from '@sipheron/vdr-core'\nimport { createReadStream } from 'fs'\n\nconst stream = createReadStream('/path/to/massive-video-file.mp4')\n\nconst hash = await hashFileStream(stream, {\n  onProgress: (bytesRead) => {\n    console.log(`Hashed ${bytesRead} bytes...`)\n  }\n})\n\nconsole.log('Final fingerprint:', hash)\n```\n\n---\n\n## 📄 Integrity Reports\n\nEnterprise buyers, auditors, and compliance officers often require a human-readable summary of anchored documents. You can natively generate professional PDF reports providing a comprehensive chain of custody for any date range or tag set:\n\n```typescript\nimport { generatePdfReport } from '@sipheron/vdr-core'\nimport { writeFileSync } from 'fs'\n\nconst pdfBytes = await generatePdfReport({\n  anchors: [anchor1, anchor2], // or fetch from sipheron.list()\n  dateRangeStr: 'Q1-2026',\n  solanaNetwork: 'mainnet'\n})\n\nwriteFileSync('./audit_report.pdf', pdfBytes)\n```\n\n---\n\n## Error Handling\n\nVDR Core exports structured, programmatic error classes so you can handle failures predictably in production workflows:\n\n```typescript\nimport { \n  ValidationError, \n  AuthenticationError, \n} from '@sipheron/vdr-core'\n\ntry {\n  await sipheron.anchorBatch(...)\n} catch (err) {\n  if (err instanceof AuthenticationError) {\n    console.error('Invalid or missing API key')\n  } else if (err instanceof ValidationError) {\n    console.error('Invalid input provided to the SDK')\n  }\n}\n```\n\n---\n\n## Real-time Webhooks\n\nIf your backend is capturing Webhooks emitted from SipHeron's managed platform, always cryptographically guarantee they originated from SipHeron:\n\n```typescript\nimport { parseWebhookEvent, webhookMiddleware } from '@sipheron/vdr-core'\n\n// Method 1: Manual parsing with timestamp tolerance (replay protection)\nconst event = parseWebhookEvent({\n  body: rawRequestBodyStr,\n  signature: req.headers['x-sipheron-signature'],\n  secret: process.env.SIPHERON_WEBHOOK_SECRET,\n  tolerance: 300 // Reject signatures older than 5 minutes\n})\n\nconsole.log(event.type) // 'anchor.confirmed'\n\n// Method 2: Framework specific drop-in Middleware\n// Supported: express, nextjs, fastify, awsLambda, cloudflare\napp.post('/webhook', express.raw({ type: 'application/json' }), webhookMiddleware.express(process.env.WEBHOOK_SECRET), (req, res) => {\n  console.log('Valid Payload!')\n  res.send('OK')\n})\n```\n\n---\n\n## Resources & Community\n\n- 📚 **Documentation:** Check out our [Full API Reference](https://docs.sipheron.com).\n- 🐛 **Issue Tracker:** Found a bug? Open an issue on our [GitHub Repo](https://github.com/SipHeron-VDR/vdr-core/issues).\n- 💬 **Discord:** Join the [community discussion](https://discord.gg/sipheron).\n\n### Security\n\nOpen Source SDK licensed under **Apache-2.0**. To report a security vulnerability or timing attack related bug within Hashing/Webhook signatures, please coordinate via `security@sipheron.com` before posting publicly.\n","readmeFilename":"README.md"}