Proven immutable data*
File hashes stored on the Hive blockchain
* data: documents, files, images, music, zip, software, 1010101000, etcetera
Proof your file
Step 1: Select file to be fingerprinted
Store fingerprint
All data displayed on the right is stored publicly on the Hive chain
1. Add additional data to store
Storing the fingerprint is obligatory, the rest of the data you can optionally add yourself:
The fingerprint will be stored utilising the public transfer method.
Therefore you need to pick an (any) amount of Hive or HBD you need to send.
Your donation will be used to maintain this service.
Don't have a Hive account? Sign up here
2. Set amount
3. Post fingerprint to the Hive chain via
Tamperproof blockchain-based file fingerprint integrity
Proof.ink's service is pretty straightforward. If you have a document of which you want to know with 100% certainty that it's contents has not been changed, tampered with or altered in any form, use Proof.ink.
Proof.ink works by fingerprinting your file (no matter how big), without the need to upload it, inside your browser. The result of this calculation is a unique SHA256 hash / fingerprint of your file.
By enabling you to store the fingerprint publicly on the Hive blockchain, Proof.ink can guarantee the integrity of the fingerprint of the file as how it was created at a given time by a given user. This way others can use this service to validate the fingerprint on the blockchain and against the file they receive.
The Hive chain serves as a public accessible ledger with provable immutability at it's core, for a trustless public store of the derived file's fingerprint.
Proof.ink is made by @roelandp
learn more - view source
Validate your file
So you have received a file along with a proof.ink.*.txt certificate file and want to validate the integrity of the original file?
Step 1: Select files to be validated. Select both the original file and the proof.ink.*.txt certificate file in one go.
Questions & Answers
- What do you do with my files?
- Actually.... Nothing! This site (or app if you will) solely run in your browser. The fingerprinting happens without the need for you to upload your data. Try it! You can disconnect from the internet if you want. After the fingerprinting you can store the resulting 'hash' or fingerprint on the Hive blockchain.
- What do you need from me?
- Well... You need a file to be fingerprinted. And then you need a Hive account. Don't have one? Sign up instantly now!
- What is a hash/checksum/fingerprint?
- From Wikipedia: A checksum is a small-sized datum derived from a block of digital data. Checksums are often used to verify data integrity but are not relied upon to verify data authenticity.
- Why is hashing useful for proving file integrity?
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- The hashing function used on this site is meant for one-way, so infeasible to invert.
- The fingerprint is deterministic so the same data always results in the same fingerprint. This fact is used to help you prove the immutability of a given file you want to analyse using Proof.ink
- Depending on the filesize, it is quick to compute the hash
- It is infeasible to generate a message from its hash value except by trying all possible messages
- A small change to a document should change the fingerprint so extensively that the new fingerprint appears uncorrelated with the old fingerprint
- It is infeasible to find two different messages with the same fingerprint
- What is the Hive Blockchain?
- The Hive blockchain is a decentralised proof of stake blockchain with 3 second blocktimes and quick confirmations. By using the Hive blockchain Proof.ink can build a trustless store of fingerprints on a blockchain which responds near instant and therefore keep the service "snappy". A fingerprint is ready while you wait, depending on your processor speed and filesize, and storing them doesn't take longer than 3 seconds if you have a Hive account readily available.
- How can I get a Hive account?
- Hive is a free to use blockchain. Registerring an account however costs a little bit of Hive currency (3 Hive at the time of writing). Some faucets issueing free accounts do exist, but have a waiting time of 2 weeks or more. You can easily signup for a paid account (think 2-4 dollars at time of writing) via for example the HiveWallet.app - opensource mobile Hive Wallet for iOS and Android or directly on Proof.ink for a small fee.
- How much does your service cost?
- Storing the fingerprint on the Hive chain is done by sending a public transfer to the @proof.ink account on the Hive chain, including your 'fingerprint' in the message's "memo"-field. Intrinsic to transferring is that you need to send a bit of Hive or Hive dollars along. It is up to you to decide how much Hive you send. Any funds you send will be used to maintain the service. A recommended amount is pre-filled, but you can go as low as 0.001 Hive/HBD or as high as sending all the Hive/HBD you have!
- Who are you?
- My name is RoelandP, I am a huge fan of the Hive and related graphene chains. Here are some of my links: github, twitter, hive blog and my personal landingpage.