Life & fun · alternatives · 2026
24 alternatives to Bitcoin Challenge. Try to steal a plain text private key you can use
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:…
Bitcoin Challenge is a browser security demonstration that hides a real Bitcoin private key in plaintext while allowing full interaction—users can copy, paste, and manipulate it, but cannot view or extract the actual… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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Fill out and generate PDFs with a simple API request. Design templates in our drag-and-drop editor, POST your JSON data, and download a finished PDF in seconds.
2018 · formapi.io · its alternatives →
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The Bitcoin Note: Physical secure Bitcoin that you can easily share, spend or hold.
2022 · offline.cash · its alternatives →
- 3SA
I built this machine so I could generate Bitcoin keys that I could trust. Air-gapped and simple to use and understand (mechanical). The Satoshi 9000 demo: https://youtu.be/bJiOia5PoGE The key value proposition of the machine is that it generates analog randomness in the physical world and converts it into digital (1’s and 0’s) randomness. Seamlessly. But it occurs to me that it may have other uses beyond crypto keys for your own use, such as: * Randomized clinical trials. Clinical trials need a high degree of transparency for ethical reasons; also, for legal reasons should it…
2024 · its alternatives →
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Learn the basics & fundamentals of bitcoin, 💯 free!
2018 · 10daysofbitcoin.com · its alternatives →
- 5CY
2018 · crapcoin.solutions · its alternatives →
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BlueWallet▲97An easy to use and secure Bitcoin wallet for iOS
2018 · bluewallet.io · its alternatives →
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Ask questions in plain English. BlockscopeChat decodes transactions, profiles wallets, and traces stolen funds across 8 chains.
Jul 2026 · chat.blockscope.co · its alternatives →
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Bitcoin made easy. Contribute to ofek/bit development by creating an account on GitHub.
2017 · github.com · its alternatives →
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Prove that you said things before anyone else
Jun 2026 · yousaidthat.org · its alternatives →
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21bitcoin▲66Buy & sell bitcoin with this intuitive mobile app
2021 · 21bitcoin.app · its alternatives →
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Bitcoin made easy. Contribute to ofek/bit development by creating an account on GitHub.
2019 · github.com · its alternatives →
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World's 1st decentralized, anarchistic all-digital currency!
2015 · its alternatives →
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A collection of simple programs which can generate bitcoin wallets, create and sign transactions, and send transactions over the bitcoin network. - prettymuchbryce/hellobitcoin
2014 · github.com · its alternatives →
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$17,500 for the best #bitcoin stories
2024 · writingcontests.xyz · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →