A new Fediverse Enhancement Proposal (FEP) has been created on Object Integrity Proofs.
Find the draft proposal here https://codeberg.org/fediverse/fep/src/branch/main/feps/fep-8b32.md
Feedback is appreciated at https://socialhub.activitypub.rocks/t/fep-8b32-object-integrity-proofs/2676