# 2. Origins

- [Segregated Witness (SegWit) Upgrade](/2.-origins/segregated-witness-segwit-upgrade.md)
- [Taproot Upgrade](/2.-origins/taproot-upgrade.md)
- [Inscriptions](/2.-origins/inscriptions.md)
- [Ordinal Theory (Ordinals)](/2.-origins/ordinal-theory-ordinals.md)
- [Rarity](/2.-origins/ordinal-theory-ordinals/rarity.md)
- [Supply of Rare Satoshis](/2.-origins/ordinal-theory-ordinals/supply-of-rare-satoshis.md)
- [Names](/2.-origins/ordinal-theory-ordinals/names.md)
- [BRC-20](/2.-origins/brc-20.md)
- [Why Runes?](/2.-origins/why-runes.md)