Here’s a TLDR:
- reduces block space for inscriptions and complex transactions to 1MB
- blocks with normal transactions can still occupy up to 4MB
- uses Satoshi’s double-hash method to enable pruning of OP_RETURNs without breaking the ability to reverify the block’s Merkle Tree
https://nitter.privacyredirect.com/colbyserpa/status/1974839702793675104#m