SHAPESHIFTCD

Early bitcoin NFTs were not immutable.

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

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

xcpcards.com/SHAPESHIFTCD 8dcd2f3be5b3

The identifier 8dcd2f3be5b3 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 SHAPESHIFTCD one of the first real crypto cards!

Techincal Details

The file's full sha-256 hash in hex and base64 encodings:
8dcd2f3be5b3900c01a8acb8d7010f10cc202e1863ad143f2c2407572ad1fea5
jc0vO+WzkAwBqKy41wEPEMwgLhhjrRQ/LCQHVyrR/qU=

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.