CNPCARD

Early bitcoin NFTs were not immutable.

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

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

xcpcards.com/CNPCARD iZ9yvhng

The identifier iZ9yvhng 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 CNPCARD one of the first real crypto cards!

Techincal Details

The file's full sha-256 hash in hex and base64 encodings:
899f72be19e07d2e4bf6377eca50c00b9edbf3eaffc650bf98d9da60fcef2501
iZ9yvhngfS5L9jd+ylDAC57b8+r/xlC/mNnaYPzvJQE=

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.