MINERCARD

Early bitcoin NFTs were not immutable.

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

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

xcpcards.com/MINERCARD rBK8sXoR

The identifier rBK8sXoR 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 MINERCARD one of the first real crypto cards!

Techincal Details

The file's full sha-256 hash in hex and base64 encodings:
ac12bcb17a11daf9148d4e2db8ca32b3dff3d4a2678703011bd03aaf85bb9195
rBK8sXoR2vkUjU4tuMoys9/z1KJnhwMBG9A6r4W7kZU=

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.