Proof.ink

Proven immutable data stored on the Steem blockchain

#3 Product of the DayFebruary 04, 2019

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.

Reviews
  • MainFrame World
    MainFrame WorldI am Groot
    Pros: 

    Built on a proven/scalable blockchain Steem.
    Blockchain immutability feature accredits product's credibilty and integrity.
    Easy to use.

    Cons: 

    Early days... Will get better with more use and reviews.

    Steem as a blockchain platform offers the ideal environment for building social and crowd-related Dapps. The platform has an already existing community of users to increase Dapp adoption and utility with little cost.

    MainFrame World has used this product for one day.
  • Pros: 

    Built on the immutable Steem Blockchain but a talented developer

    Cons: 

    Early days - more users will arrive

    Steem Blockchain has some brilliant qualities and is worth looking into.

    Crypto Curator has used this product for one day.
Discussion
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г๏єlคภ๔ ק. lคภ๔єﻮєภtMaker@roelandp · chef d'inspiration Tales & Tours + Dull
Hi Product hunters! Last week on cryptotwitters @btsfav was requesting a blockchain based product which I thought would be cool to make! A simple blockchain (proof of time) storage of file hashes to proof file integrity based on a trustless environment. And this is what I made - Proof.ink - a 24hr weekend endeavour using all tools out there: - Steem.io Developer SDK's - Undraw.co - thank you @bramk for reminding me - Bootstrap, Cryptojs and Filehashing, Filesaver.js - Stackoverflow.com I think proof.ink is a nice little web app focussing on 1 thing only, namely generating an offline file hash/fingerprint and optionally storing it on the Steem blockchain for proof of time. You can use it for example in fav's usecase: "So I got a signed PDF, and all parties need to be able to verify the hash on chain via a tool to check whether it's still the original file". Thanks @fav for the inspiration! Let me know what you think?
Younghwi Cho
Younghwi Cho@andrew_cho · Co-founder of Steemhunt
@roelandp This is such a brilliant idea!
Bobinson K B
Bobinson K B@bobinsonkb · dreamer, Migrate2Cloud.com | agileblaze
@roelandp "So I got a signed PDF, and all parties need to be able to verify the hash on chain via a tool to check whether it's still the original file" - this is a scenario I have came across many times. Few days I came across a solution for the shipping industry where "Title deed", Bill of Lading etc are handled using a blockchain based solution. This can be extended to such use cases IMHO. Also the best part I see is that this on a public blockchain in the true sense of "public ledger" ideology as opposed to be on a "private chain".
г๏єlคภ๔ ק. lคภ๔єﻮєภt
г๏єlคภ๔ ק. lคภ๔єﻮєภtMaker@roelandp · chef d'inspiration Tales & Tours + Dull
@bobinsonkb oh yes that shipping thing is interesting. And you have all the "provenance" initiatives. I like the Steem chain indeed for being available publicly and also the fast confirmation times and fee-less posting, which has low entry barriers for users to start using services like these 😉
Sebastian Kim
Sebastian KimPro@sebastiank · Co-founder at Steemhunt
This is a nice little app that utilizes Steem blockchain in a brilliant way :) Love it!
г๏єlคภ๔ ק. lคภ๔єﻮєภt
г๏єlคภ๔ ק. lคภ๔єﻮєภtMaker@roelandp · chef d'inspiration Tales & Tours + Dull
@sebastiank thank you Sebastian! You are a pro!
Elizabeth S Hunker
Elizabeth S Hunker@elizabethhunker · elizabeth.ai
Nice. Would love to see a thriving app ecosystem on @steemit @roelandp
Kevin Sad
Kevin Sad@kevin_sad · Sad forever
great