Seal the integrity of your archives in a public blockchain via a Merkle tree, without ever exposing your data.
Hextal's batched Merkle anchoring cryptographically seals the integrity of your documents and audit logs in a public blockchain (Bitcoin, Ethereum) without ever exposing your data content. The principle is simple: multiple documents are condensed into a single Merkle root, and only this root is recorded on the blockchain. This technique provides the evidentiary weight of a public blockchain while preserving the absolute confidentiality of your information.
The Merkle tree is built periodically — hourly, daily, or at your chosen cadence — from all the documents and audit events produced since the last anchoring. Each document can be individually verified by reconstructing its path through the tree (Merkle proof), without having to reveal the other documents in the batch. The anchoring is timestamped and certified by the blockchain, providing an independent, tamper-proof proof of existence.
This mechanism is particularly useful for organisations that need to demonstrate to a third party (auditor, regulator, partner) that a document existed at a given date, without entrusting their data to a trusted third party. Verification is entirely autonomous: all you need is the original document and the Merkle proof to validate the anchoring in the blockchain.
Only the Merkle root is recorded publicly. No data, even encrypted, ever leaves your infrastructure.
The public blockchain provides verifiable proof of existence without depending on Hextal or any trusted third party.
Batching multiple documents into a single blockchain transaction significantly reduces anchoring costs.
The Merkle proof enables verification of a specific document's integrity without revealing the other documents in the batch.