Merkle Tree Ledger for Tamper-Proof Audit Logs | VeilChain

We’re excited to announce the launch of VeilChain, an open-source merkle tree ledger service designed to bring Bitcoin-grade data immutability to your applications. VeilChain provides tamper-proof audit logs and cryptographic data integrity without the overhead of running a full blockchain.

The Problem: Data Integrity Without Blockchain

Modern applications need verifiable data integrity. Whether you’re building immutable audit logs for compliance, document notarization systems, or supply chain tracking, you need cryptographic proof that data hasn’t been tampered with.

Blockchain seems like the obvious solution, but it comes with significant downsides:

• Consensus overhead - Mining or staking delays every write operation
• Token economics - Gas fees and cryptocurrency complexity
• Scaling challenges - Limited throughput and storage costs
• Operational burden - Node management and network participation

The VeilChain Approach: Merkle Trees for Immutable Ledgers

VeilChain strips away the blockchain complexity while keeping the cryptographic guarantees. At its core, VeilChain uses merkle trees - the same tamper-proof data structure that powers Bitcoin’s transaction verification - to create an immutable ledger.

How It Works

1. Append entries - Hash your data and add it to the merkle tree. Each entry is immutable once added to the ledger.

2. Generate merkle proofs - Get compact O(log n) cryptographic proofs that any entry exists in the immutable ledger.

3. Verify anywhere - Merkle proofs can be verified offline, by anyone, without needing to trust VeilChain.

4. Anchor externally - Publish your merkle root hash to Bitcoin, Ethereum, or public transparency logs for ultimate tamper-proof verification.

Use Cases for Immutable Ledgers

VeilChain merkle tree technology is perfect for:

• Tamper-Proof Audit Logs - SOC2, HIPAA, and SOX compliant immutable audit trails with cryptographic verification
• Document Notarization - Prove documents existed at a specific point in time using merkle tree proofs
• Supply Chain - Track provenance with verifiable chain of custody in an immutable ledger
• Legal Evidence - Court-admissible cryptographic proof of data integrity
• Regulatory Filing - Prove what was filed and when for compliance with tamper-proof records

Getting Started

Install the SDK:

npm install @veilchain/core

Create your first immutable ledger:

import { MerkleTree, sha256 } from '@veilchain/core';

const tree = new MerkleTree();
tree.append(sha256('My first audit log entry'));

console.log(`Root: ${tree.root}`);

Open Source

VeilChain is fully open source under the MIT license. Self-host it with Docker, embed it in your applications, or use our managed API.

Get started with the documentation or view the source on GitHub.

We’re just getting started. Follow our blog for updates on new features, integration guides, and deep dives into the cryptography behind VeilChain.