What is an ordinal NFT (electronic artwork, inscription)?

1. Transaction witness data field: This is where the data and content of the NFT are stored.

2. Inscription: It is the main body of NFT - the actual content placed on the Bitcoin blockchain. NFT represents the ownership of these contents. An inscription is engraved on the transaction's input witness data field, and the NFT is assigned the first satoshi of the transaction's first output. You’ll also see people refer to inscriptions as “electronic art/ordinal NFTs” – the three terms have become synonymous.

3. Envelope: The inscription will be stored in an area (within the witness data) that Rodarmor calls the "envelope".