1. Load a sealed slot
Confirm the current address with a compatible wallet, send bitcoin, and wait for the confirmations you require.
Bitcoin you can hand to someone.
Load a sealed slot, tap to verify it, and pass the card. The recipient can keep the bitcoin on the card, hand it onward, or unseal and sweep it into a wallet they control.
SATSCARD is a physical bearer Bitcoin card with ten independent slots. Funding stays at the current sealed slot address while the card changes hands, so a physical handoff does not require a new on-chain transaction. A compatible wallet can verify the card before acceptance.
Load. Verify. Hand it over.
2. Tap and verify
Check card identity, current slot, address, funding, and sealed state before you give or accept it.
3. Hand it over
Transfer the card, six-digit CVC, and RF-blocking sleeve. Ownership can travel with the physical object.
Made for tangible bitcoin moments
Give actual bitcoin
Fund the gift before the recipient has chosen a wallet or shared a receive address. Include the official recipient instructions.
Settle in person
Verify a loaded sealed card before completing an exchange. Apply a confirmation policy appropriate to the amount.
Teach and collect
Use a physical object to explain self-custody, or choose an artist design that makes the handoff memorable.
SATSCARD is not TAPSIGNER
| SATSCARD | TAPSIGNER | |
|---|---|---|
| Choose it when… | The bitcoin should travel with the card | One owner wants a reusable signing key |
| Key model | Ten independent bearer slots | One BIP-32 master key |
| Normal exit | Unseal one slot and sweep | Sign transactions through a compatible wallet |
Read the full SATSCARD vs TAPSIGNER comparison.
Verify before you accept
A SATSCARD recipient should check the factory certificate with compatible software, confirm the current slot is sealed, match the payment address, and check the on-chain funding and confirmations. A simple physical handoff does not prove safe custody by every previous holder.
Know the irreversible step: unsealing exposes the current slot key and permanently advances the card.
Prepare a trusted destination wallet before you begin, sweep the entire balance, and never fund that old address again.
New to the product?
Understand the complete lifecycle, including what possession does and does not prove.
Giving one?
Use the gift checklist so the recipient gets a funded card and usable instructions.
Receiving one?
Verify before accepting, then decide whether to keep the slot sealed or sweep.
Open protocol, inspectable operation
Coinkite publishes the NFC protocol, reference Python implementation, certificate-verification guidance, and command-line tools. Open implementation makes independent review and wallet integration possible. It does not replace correct software, physical custody, or a careful sweep workflow.