# Book A

URL: https://blockspace.wiki/glossary/book-a/

The inclusive book: the whole transactions bought for a token, shared where shared. When several tokens share a transaction, its bytes divide among them under the [Shared Claim Axiom](https://blockspace.wiki/glossary/shared-claim-axiom/). In the [partition](https://blockspace.wiki/glossary/the-partition/) it is content + structure + overhead, "bytes bought for you at all", and it is the backing measure. Fees follow Book A.

On every entry C ≤ B ≤ A, so Book A is the widest of the three books.

Sources:

- Blockspace Holdings records
- block.space docs: BTI · https://block.space/docs/bti

Updated: 2026-10-20