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1 BTC challenge (still available)bitaps.com/mnemonic/challenge
2 sats \ 1 comment \ @RottingCleaner 18 Oct 2022 bitcoin
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119 sats \ 0 comments \ @R7 9 Jul 2025 Stacker_Sports
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Human Rights Foundation Announces 20 Btc Bounty Challenge For Bitcoin Devbitcoinmagazine.com/business/human-rights-foundation-announces-20-btc-bounty-challenge-for-bitcoin-development?utm_source=carrot&utm_medium=partner&utm_campaign=carrot_share
231 sats \ 0 comments \ @BitcoinIsTheFuture 28 Jul 2023 bitcoin
1000 btc puzzle rewards πŸ”₯πŸ”₯πŸ”₯privatekeys.pw/puzzles/bitcoin-puzzle-tx?table=0&status=solved
153 sats \ 4 comments \ @Danmobile 5 Dec 2025 bitcoin
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