btproof - trusted timestamping on the Bitcoin blockchain

In plain words

btproof is a trusted timestamping service that records information on the Bitcoin blockchain. Launched in 2013, it provides users with a way to create cryptographic proof that data existed at a specific point in time using blockchain technology. The service is designed for anyone needing to establish verifiable timestamps for documents or digital content. btproof leverages Bitcoin's immutable ledger to offer permanent, third-party-independent time verification.

written from the facts on this page · September 2026

• 
  TimeSeal2023 · timeseal.com · ▲116

  Restoring digital trust, one blockchain timestamp at a time

• BC
  Bitcoinproof - Create a forgery-proof timestamp for your data2013 · vog.github.io · ▲8
• 
  Bitproof2015 · ▲113

  True certification in the bitcoin blockchain

• 
  Claimby2018 · claimby.com · ▲107

  Free legally-valid timestamps for your files, ideas & art.

• SV
  Seal – Verifiable timestamp for your private ideas2022 · docs.planet.ink · ▲113
• 
  Bitrated – Bitcoin m-of-n arbitrated transactions2013 · bitrated.com · ▲155

  Bitcoin Trust Platform - Identity & reputation management, multi-signature smart contracts and consumer protection for Bitcoin and other cryptocurrencies.

• 
  SimCity, but with Permits▲907

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 1d ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 13d ago · tanzaniaeducationproject.org

• 
  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 14d ago · bigwords.page

• 
  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 8d ago · guitoro.com

• 
  See *almost* any carriers phone settings▲432

  Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.

  Life & fun · 12d ago · carrierexplode.com

• 
  The whole Solar System and every tracked satellite, live in the browser▲407

  Life & fun · 22d ago · space.bl2.net

• 
  My seven minute workout timer evening project▲760

  Work · 2013 · 7-min.com

• 
  Automatic weekly meal planner, also plans your leftovers▲747

  Eat This Much creates personalized meal plans tailored to your preferences, budget, and schedule. Achieve your dietary goals with our calorie calculator, weekly plans, and grocery lists. Start planning your meals in seconds.

  Work · 2013 · eatthismuch.com

• 
  Remove backgrounds from images online▲571

  Remove background from image 100% automatically — Smart Clip Editor — Crop, rotate, fix colors, add shadows & reflections — for Free

  Life & fun · 2013 · clippingmagic.com

• 
  Free hi-resolution photos for your website. 10 new photos every 10 days▲357

  Beautiful, free images and photos that you can download and use for any project. Better than any royalty free or stock photos.

  Work · 2013 · unsplash.com

• 
  Learn English with movies and TV Shows▲287

  Learn English by watching movies and TV series with Fleex: discover idiomatic English expressions; improve your English grammar and enrich your English vocabulary.

  Life & fun · 2013 · fleex.tv

• CJ
  Create Javascript charts with one line of Ruby▲272

  Life & fun · 2013 · ankane.github.io