This product was not featured by Product Hunt yet. It will not be visible on their landing page and won't be ranked (cannot win product of the day regardless of upvotes).
Turn a spare phone into an offline transaction signer. BitTool Signer keeps keys on the offline device and exchanges signing requests and signatures by QR. Supports Bitcoin, EVM, Solana and TRON, with public source and a separate online companion.
Hi Product Hunt — I'm Tom, building BitTool Signer.
BitTool Signer is an offline transaction-signing app for iOS and Android. A dedicated offline phone holds the keys and reviews signing requests; QR codes carry requests and signatures between it and an online companion, which prepares and broadcasts transactions. It supports Bitcoin PSBT, EVM transactions, Solana and TRON.
The iOS source is MIT-licensed, and the Android source is public. Build instructions, tests and compatibility limits are available in the repositories. Public security reviews are AI-assisted and include disclosed findings; we have not claimed an independent third-party audit.
I'd welcome feedback on the setup flow, transaction review, QR interoperability and build reproducibility.
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About BitTool Signer on Product Hunt
“Turn a spare phone into an offline crypto signer”
BitTool Signer was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #79 on the daily leaderboard. Turn a spare phone into an offline transaction signer. BitTool Signer keeps keys on the offline device and exchanges signing requests and signatures by QR. Supports Bitcoin, EVM, Solana and TRON, with public source and a separate online companion.
BitTool Signer was featured in Android (57.7k followers), Open Source (69k followers), GitHub (41.5k followers), Cryptocurrency (5.7k followers) and Security (3k followers) on Product Hunt. Together, these topics include over 112.8k products, making this a competitive space to launch in.
Who hunted BitTool Signer?
BitTool Signer was hunted by Tom. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Tom
Hi Product Hunt — I'm Tom, building BitTool Signer.
BitTool Signer is an offline transaction-signing app for iOS and Android. A dedicated offline phone holds the keys and reviews signing requests; QR codes carry requests and signatures between it and an online companion, which prepares and broadcasts transactions. It supports Bitcoin PSBT, EVM transactions, Solana and TRON.
The iOS source is MIT-licensed, and the Android source is public. Build instructions, tests and compatibility limits are available in the repositories. Public security reviews are AI-assisted and include disclosed findings; we have not claimed an independent third-party audit.
I'd welcome feedback on the setup flow, transaction review, QR interoperability and build reproducibility.
Product and downloads: https://bittool.com/signer/
iOS source: https://github.com/bitbill/bitto...
Android source: https://github.com/bitbill/bitto...