This is a cool use of OP_RETURN
How many vbytes and how many actual hardware bytes does it consume per character? 1 and 1? #asknostr
Discussion
Ah ok the answer is yes, 1 byte, 1 vbyte. People are paying like 4 sats per character of nostr notes stored on the timechain right now, and it takes up exactly 1 byte per character on every full node.