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PURE
TRUST
SEAL

Cryptographic proof your documents haven’t changed

Every sealed PURE document is hash-chained in DocTrace, then the daily root is anchored to a public, immutable timestamp. Anyone can verify a document is authentic — without trusting PURE’s servers.

SHA-256 hash chain₿ Bitcoin-anchored ESIGN / UETANo crypto wallet needed

Verify a document

Drop a document to verifyIt’s hashed locally in your browser — the file never leaves your device
or paste a document hash / ID

Public anchor ledger

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Each day’s completed documents are combined into one Merkle root and that root is written to the Bitcoin blockchain via OpenTimestamps. The block height is the public, tamper-proof timestamp — it cannot be altered or back-dated by anyone, including PURE.

How TrustSeal works

1
Sign & seal

PureSign hashes the completed document (SHA-256) into the DocTrace chain.

2
Daily Merkle root

All sealed docs that day roll into one root hash.

3
Anchor to Bitcoin

The root is timestamped on a public chain via OpenTimestamps.

4
Verify anytime

Recompute the hash, follow the Merkle path to the anchored root.

PURE TrustSeal · first-party notarization on public infrastructure · powers the PureSign certificate seal · open PureSign