Final Word on Bitcoin Core vs Knots, Which Treasury Company is Best
September 24, 2025•22 words
Note: The Listed platform will permanently shut down December 31, 2026. Your data published on Listed will still be available in your personal Standard Notes account. Learn more
More from San Diego BitcoinersAll posts
Tangem Wallet Vulnerabilities
September 22, 2025•448 words
Disclosure: author is a reseller for Coinkite
If you're not familiar with Tangem wallet, it's an NFC card that acts as cold storage for different cryptocurrencies by using Near Field Communication to sign transactions and move funds by coordinating with a smart phone. This allows for the master private key to stay on the card, acting as an affordable ($54 for 2 cards as of this writing) cold storage option.
Tangem's main page describes that the key can't be extracted and the card pin can't b...
Read postColdcard/Tapsigner Start Guide
October 7, 2025•121 words
Before Using your Coldcard or Tapsigner
Coldcard
Before opening your coldcard bag, inspect for tears or attempts to reseal. Note the serial of the bag. The same number will flash on the device when you turn it on. This is how you know it's a legit Coinkite product. More info here.
If I gave you an SD card, it has the most recent firmware update (instructions). You can also use it for importing/exporting transactions.
Tapsigner
Tap the card to your NFC enabled phone to ensure that they can ...
Read post