# the three books

URL: https://blockspace.wiki/glossary/the-three-books/

BTI's three answers to "how many bytes back this token?": Book A (inclusive), Book B (regional) and Book C (content). On every entry C ≤ B ≤ A.

Sources:

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

Updated: 2026-10-20