Contract Chapel: seal your files and texts with immutable proof on the blockchain

Jack — Mon, 06 Apr 2026 11:11:19 +0000

Contract Chapel – Cryptographic sealing tool

Protect your creations and documents with immutable and verifiable proof on the blockchain.

How it works:
Connect your wallet
Establish a secure link with the blockchain to prepare the anchor. No file transfer is needed at this point.
Calculate the hash locally
Your text or file remains entirely on your device. The SHA-“512 algorithm generates a unique fingerprint. Even a minimal modification of the file completely changes the hash.
Confess & seal
The hash is registered on the blockchain, creating proof of existence and authorship. You get a readable PDF receipt that can be used to verify your document at any time.
Why use Chapelle du Contrat:
Total security: your original files never leave your machine.
Immutable proof: the hash is engraved on the blockchain, impossible to falsify.
Full control: you choose when and what to seal.
Easy to use: simple interface, even for those who do not know the blockchain.
Additional features:
Proof verification via Tx on the blockchain.
Local calculation of hashes to test or prepare your files free of charge.
Backup and export of PDF receipts for archive or consultation.
Compatible with text and files of all kinds (except ZIP).

Summary of the flow:
Text/local blockchain hash file searchable proof with PDF receipt.

Golden rule: only the original file allows to exactly recalculate the hash. Loss of the file = loss of proof.

https://github.com/pharejaune/Chapelle-du-Contrat/releases
hello@xcryptomint.com
https://youtu.be/Div6xD9jcYc?si=dVQtHRtpKN0cDove
( Project PTW3 https://youtu.be/sasREL3yUo0 )

DEV Community: Jack

Contract Chapel: seal your files and texts with immutable proof on the blockchain