"The use of Forth primitives in the scripting language allows anything to be coded. So, there are provisions for future changes already. There are codes that are under deployed that are reserved for future cryptographic algorithms in the event that SHA 256 is compromised or that ECDSA becomes obsolete. These will not remove the ability to use these earlier cryptographic primitives rather add to them. For instance, MD5 and SHA1 are each available within the protocol right now."

The Genesis block and a ‘set-in-stone’ protocol.
ZeMing M. Gao
Jun 20, 2022
https://coingeek.com/the-genesis-block-and-a-set-in-stone-protocol/