The tricky part is the "pay for it and receive the decryption key". We architected Fanfares to remove as much friction as possible for creators to start (no running your own L402, etc) and with as much sovereignty as possible (all events signed by creator) and as interoperable as possible (no unique event kinds, just tags that facilitate payment).

not quite. the event is public as usual. it either contains a tag with the encrypted text content or it has a link to an encrypted file hosted on a CDN or blossom server. see? this is an encrypted note you can buy, but the unencrypted content is the preview content. this note also has an encrypted image in it. you can zap the note here, login to fanfares, and the note will unlock. you can view the json of the note in fanfares if you want