Use case

Blockchain proof for your documents

Anchoring a document in the Bitcoin blockchain means creating decentralized, immutable proof of existence verifiable by anyone. Proxae makes this process accessible — no cryptocurrency, no wallet, no installation needed.

The Bitcoin blockchain is the most secure ledger in the world. Proxae lets you anchor the fingerprint of any document in it — no technical knowledge, no cryptocurrency, no installation required.

Anchor in Bitcoin →

Why blockchain?

Centralized servers can be hacked, altered, or shut down. The Bitcoin blockchain is decentralized, immutable, and maintained by thousands of nodes worldwide. A proof anchored in Bitcoin is permanent.

Real-world examples

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An association certifies its meeting minutes in the blockchain — immutable proof that decisions were made at a given date.

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A journalist timestamps sources and investigation notes — protection against fabrication accusations.

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A notary complements official deeds with blockchain anchoring — dual layer of proof, physical and digital.

How Proxae uses the blockchain

Cryptographic fingerprint

The SHA-256 hash of your document is computed in your browser. It is a unique 64-character fingerprint.

Anchoring via OpenTimestamps

The fingerprint is submitted to the OpenTimestamps protocol, which aggregates it with others into a single Bitcoin transaction.

Confirmation in a block

In ~3 hours, the fingerprint is included in a Bitcoin block. It will remain there forever, verifiable by anyone.

The Bitcoin blockchain is the most secure ledger in the world. Anchor your document in seconds — free and no setup needed.

Anchor in Bitcoin

Bitcoin blockchain vs other methods

	Proxae	Centralized service	Private blockchain
Cost	✓ Free	Varies	High
Speed	✓ Instant	Varies	Varies
Privacy	✓ Full (local hash)	File uploaded	Varies
Permanence	✓ Permanent (Bitcoin)	Depends on service	Depends on operator

Advantages of blockchain proof

✦ Immutable — impossible to modify or delete a proof
✦ Decentralized — no single point of failure
✦ Verifiable — by anyone, without permission
✦ Accessible — no Bitcoin or wallet needed

Frequently asked questions

Do I need Bitcoin to use Proxae?

No. Proxae handles the blockchain anchoring for you. No cryptocurrency, no wallet required.

What happens if Proxae shuts down?

Your proofs remain in the Bitcoin blockchain. The OTS file is an open standard — you can verify it with any OpenTimestamps client.

Is the proof really in Bitcoin?

Yes. Each confirmed proof is linked to a specific Bitcoin block, verifiable on any block explorer (Blockstream, Mempool, etc.).

Why Bitcoin and not another blockchain?

Bitcoin is the oldest, most decentralized, and most secure blockchain. Its network has been running uninterrupted since 2009 with thousands of nodes worldwide. No other blockchain offers this level of permanence.

What is OpenTimestamps?

OpenTimestamps is an open protocol that aggregates thousands of hashes into a single Bitcoin transaction. It is a standard used by businesses, governments, and individuals worldwide.

Anchor in Bitcoin

Free blockchain proof, in seconds.