FDCARD

Early bitcoin NFTs were not immutable.

In November 2015, XCPCARDS.com solved this for several cards, FDCARD included.

This was achieved by including the following text in a bitcoin transaction:

xcpcards.com/FDCARD qFEfPw9v

The identifier qFEfPw9v is the jpeg's checksum which proves the card's design. Since this text is engraved on the blockchain, the proof can never be tampered with, nor can the timestamp be disputed.

This makes FDCARD one of the first real crypto cards!

Techincal Details

The file's full sha-256 hash in hex and base64 encodings:
a8511f3f0f6fa168190b408c4febebf552625695f449feb17783e06abf9379b7
qFEfPw9voWgZC0CMT+vr9VJiVpX0Sf6xd4Pgar+Tebc=

The identifier is a 48 bit truncated hash.

This is sufficiently strong, yet short enough to have the text fit inside a Bitcoin op_return message.

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Full Set of Cards

The below cards were notarized by XCPCARDs.com

Most are from the Spells of Genesis project.

Click a card to view its details.