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Here's what air-gapped self-custody actually looks like. QR signing. Replaceable battery. Fully open source. Works with the wallets you already use.

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Keycard Shell

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914,968 просмотров • 12 дней назад •via X (Twitter)

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New flow unlocked. ⚡ COLDCARD + BULLBITCOIN.COM = a new air-gapped signing flow: 🔹 Import your wallet 🔹 Sign airgapped with BBQR 🔹 Broadcast straight from your phone Air-gapped self-custody, made simple. 🔐
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New flow unlocked. ⚡ COLDCARD + BULLBITCOIN.COM = a new air-gapped signing flow: 🔹 Import your wallet 🔹 Sign airgapped with BBQR 🔹 Broadcast straight from your phone Air-gapped self-custody, made simple. 🔐

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Pay to any QR code with crypto 🇻🇳🇧🇷🇮🇳🇵🇭 >self-custody >fiat settlement >fully compliant >works with all local QR codes >one name for all chain addresses
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Pay to any QR code with crypto 🇻🇳🇧🇷🇮🇳🇵🇭 >self-custody >fiat settlement >fully compliant >works with all local QR codes >one name for all chain addresses

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fully interoperable with Cashu wallets. here's macadamia Wallet paying the same terminal over nfc. open protocol. open money.
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fully interoperable with Cashu wallets. here's macadamia Wallet paying the same terminal over nfc. open protocol. open money.

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You search Google or ChatGPT for the "best software" and get back what looks like a recommendation. But those recommendations are shaped by incentives you never see. Here's how it actually works:
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Want to send #Bitcoin without risking your keys? That’s what PSBTs are for. COLDCARD Q signs them 3 ways, all air-gapped: – MicroSD – QR – NFC Repost + reply with your favorite signing method 👇 One reply will win a COLDCARD Q.
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