class: center, middle # Tapsigner ## NFC Bitcoin Signing Card **Demo & Security Model** ??? Welcome. Quick demo of the Tapsigner by Coinkite. Most of you already self-custody; this is for anyone looking for a simpler, more portable way to sign transactions without managing another USB device. --- layout: true <img src="cetevan-logo-dark-rev.svg" class="logo-small" alt="Tapsigner Logo"> --- class: full-image-slide <img src="solidts.jpg" alt="Solid SDB TS"> --- # What It Is - Credit-card sized NFC device - Private key generated inside secure element - Tap to sign transactions on your phone - No battery, no screen, no cables - PIN protected ??? It's a bare-minimum hardware signer. The card generates and holds the key internally. You don't plug it in; you tap it against your phone's NFC antenna. --- class: full-image-slide <img src="progression.png" alt="Custody progression"> ??? Quick map of where this fits. Tapsigner is cold storage: the private key never leaves the card's secure element. --- # Why Use It? - **Portable** — Fits in your physical wallet - **Affordable** — ~$25 vs $100-$400 screen-based hardware wallets - **Air-gapped** — NFC only - **Wallet support** — Nunchuk (Cove? Sparrow?) ??? The main appeal is friction reduction. You probably already run a cold-storage setup for your deep stack. This is for spending balances, multisig keys, or gifting pre-loaded cards. --- # Before You Fund It - **Buy from reputable source** - Coinkite.com or shop.sdbitcoiners.com - **Initialize it yourself** — Tap to your phone to test - **Change PIN** — Can do this many times - **Back up and distribute** — Export the encrypted backup. Write down backup password. Separate them. - **(Optional) Test offline with ColdCard** ??? Operational security checklist. The seller should never have handled key material. Separate the encrypted file from its decryption code so one compromise doesn't expose both. And because Tapsigner backups are ColdCard-compatible, you can prove the backup works without ever going online. --- class: full-image-slide <img src="resellers.png" alt="Resellers"> --- # Best Fits - **Spending wallet** — Daily stack, accessible but cold - **Multisig key** — One key in a 2-of-3 setup - **Onboarding** — Lower cost barrier than full HWWs for new stackers ??? Not for your entire life savings in a single-sig setup. No screen means you verify the transaction on your phone, not the device. Use it for amounts you'd accept verifying on a trusted phone, or as one key in a quorum. --- class: center, middle # Trade-offs .large[No screen = No on-device verification]<br /> .large[No seed phrase (or passphrase)] --- class: center, middle # Demo <video controls style="max-width: 90%; max-height: 500px;"> <source src="btcsessions.mp4" type="video/mp4"> Your browser does not support the video tag. </video> --- class: center, middle # Need Help Going Deeper? ## <a href="https://cetevan.com/">cetevan.com</a> Self-custody, Multisig, Running a Node Signal: @cetevan.01 Call/SMS: 619-633-CETE (2383) ??? If you want hands-off guidance through this setup—or you're ready to move up to multisig, air-gapped signing, or full node verification—reach out. I don't touch your keys; I just show you the way. --- class: center, middle # June Cete: Multisig demo