Anything you can write, you can encode: ink-20 operations, plain text, JSON. The payload travels in transaction calldata and is emitted with every mint — the contract settles ownership, the payload carries meaning.

0x7b2270223a22696e6b2d3230222c226f
70223a226d696e74222c227469636b223a
22494e4b222c22616d74223a2231303030
227d