Prior Art: Signed Hash Database

Upload a signed hash



Challenge Image

Anyone is free to post a hash, along with a signature. Use of this site is at your own risk, and I provide no guarantees as to its stability or fitness for purpose. To use this site, create a document containing your idea, and append at least 74 random characters. Create a hash using SHA-2. Sign using GPG. Then upload both the hash and the signature. If at some later point you need to prove when you wrote the intial file, you can use the signed hash here, together with the upload time stamp, to prove a bound on when you wrote it. Simples! Why 74 random bits? Well, just for your own piece of mind. 74 ASCII characters take more than 512 bits to represent (518 to be exact). If they are chosen uniformly at random there is no way to compress that part of the document below 518 bits, which is longer than a SHA-2 hash. Thus there is no way you could have been tricked into uploading a compressed version of your document.

Current Entries

Viewing entries 41 through 50 (Total entries: 778)

Hash:
Marcy
Signature:
Thank you!

Proteck'd EMF Protection Apparel
The Greatest Selection of EMF Apparel
shield clothing (Reed)
Tuesday, September 20 2022 - 11:19 AM
Hash:
Rolando
Signature:
I like this site - its so usefull and helpfull.
Check out my web site homepage
Monday, September 19 2022 - 03:37 PM
Hash:
Mora
Signature:
Keep up the spectacular work !! Lovin' it!

My webpage; web site
Monday, September 19 2022 - 05:36 AM
Hash:
Kermit
Signature:
Sports betting, football betting, cricket betting, euroleague football
betting, aviator games, aviator games money - first deposit bonus up to 500 euros.Sign up bonus
Sunday, September 18 2022 - 08:15 AM
Hash:
Latonya
Signature:
Thank you!

Proteck'd EMF Protection Apparel
The Greatest Selection of EMF Apparel
cashmere hat
Sunday, September 18 2022 - 04:05 AM
Hash:
Bridget
Signature:
Thank you!

Proteck'd EMF Protection Apparel
The Greatest Selection of EMF Apparel
electromagnetic spectrum poster [Audrey]
Friday, September 16 2022 - 02:45 PM
Hash:
Lonnie
Signature:
Thank you!

Proteck'd EMF Protedction Apparel
Thhe Greatest Selection of EMF Apparel
emf protection clothing [Yong]
Friday, September 16 2022 - 01:27 PM
Hash:
Elvis
Signature:
Thank you!

Proteck'd EMF Protection Apparel
Thhe Greatest Selection of EMF Apparel
Proteck'd EMF Clothing
Thursday, September 15 2022 - 10:52 PM
Hash:
Kandis
Signature:
Apostas esportivas, apostas eSports - Ganhe até X2000 jogos de aviador por dinheiro
apostas de futebol
Thursday, September 15 2022 - 06:09 PM
Hash:
Wilbur
Signature:
Thnk you!

Proteck'd EMF Protectiion Apparel
Thhe Greatest Selection of EMF Apparel
emf blocking
Wednesday, September 14 2022 - 10:07 AM
Powered by DRBGuestbook · PHP Web Hosting and Free PHP Scripts