yousaidthat.org

What it does

YouSaidThat lets you seal any prediction. A market call, a hot take, a thesis — with SHA-256 hashing, AES-256-GCM encryption, and RFC 3161 timestamps. No one can see it until you reveal it. Once you do, anyone can verify you wrote it exactly then, without trusting you or any platform. Built on open cryptographic standards. No accounts needed. Fully auditable. Your proof lives outside any server.

• BT
  btproof - trusted timestamping on the Bitcoin blockchain2013 · btproof.com · ▲75
• CP
  CryptoProof – post proofs to the Ethereum blockchain for free2018 · cryptoproof.org · ▲55
• MA
  MyCryptoWiki – A free cryptocurrency coin wiki2018 · mycryptowiki.com · ▲60
• LE
  Lost Ethereum2017 · ▲18

  Hi guys, I've written the first proof-of-mistake crypto token on top of Ethereum. You can see it at http://www.lostethereum.com/ It's basically a proof-of-burn substitute for users who mistakenly sent to the wrong address. It requires a web3 enabled browser, i.e chome with MetaMask, Parity, Mist, etc. This let's the web interface seamlessly interact with the Ethereum network. Let me know what you guys think.

• BC
  Bitcoinproof - Create a forgery-proof timestamp for your data2013 · vog.github.io · ▲8
• BC
  Bitcoin Challenge. Try to steal a plain text private key you can use2025 · app.redactsure.com · ▲14

  Hi HN, I'm releasing my round one public demo of a new browser security system I've been developing. There's a real Bitcoin private key (worth $20) in plaintext at app.redactsure.com. You can copy it, paste it, delete it, move it around - full control. But you can't see the actual characters or extract them. The challenge: Break the protection and take the Bitcoin. First person wins, challenge ends. Details: - Requires email verification (prevents abuse, no account needed) - 15 minute time limit per session - Currently US only for the demo (latency) - Verify the Bitcoin is real:…

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