Takeaways

Character and Note

Each character is created by an Ethereum address, aka, the creator, and can be mint to any Ethereum address.
Each note is only able to be posted under a character that the note creator owns.
Each character contains multiple notes.
Each Ethereum address can own multiple characters.
Each Ethereum address can set a primary character for itself.

All Crossbell instances(Ethereum address, character, note, general asset, single link item, link list) have an instance URI.
Link can be emitted from either character or note. Link can point to any instance on Crossbell or any external URI. Each link has a link type.
Character owner and note owner can set a link module for his character and each of his notes. The link module will be triggered during each link action.
All linking objects with the same link type and emitted from a character make up a link list.
All linking objects with the same link type and emitted from a note don’t make up a link list.
Each Ethereum address can own multiple linklists.

Each character is natively an NFT. Each note is natively not.
Each link list is natively an NFT. Every single link is not.
Linklist NFT is bound to the character NFT.
The character owner is the owner of that character NFT. It suggests that the character owner isn’t necessary to be the character creator since character NFT can be transferred.
Note owner is the owner of the character to which belongs. It suggests that the note owner isn’t necessary to be the note creator since character NFT can be transferred.
Mint can be acted on a note.
Mint can be acted from any Ethereum address to some selected Ethereum address.
Note owner can set a mint module, which will be triggered during each mint action.
Error emitting from the link module will be omitted. Error emitting from the mint module will be reverted.