Description

Contextual validation includes a check that verifies that the same ATX hasn't been referenced as previous in multiple ATXs. In ATX v1 this was also known as a Invalid Previous ATX Proof and served the same purpose: not allowing the same ATX being used as previous for multiple ATXs.

Implementation hints

The malfeasance proof needs to include the following data to be valid:

1. Both ATXs have different IDs.
2. Both ATXs have a valid signature.
3. Both ATXs reference the same previous ATX for the same identity.
4. (Possibly not necessary): If at least one ATX has contains multiple posts, proof that the reused previous ATX was referenced by the same identity
5. If one of he two ATXs that reference the same previous ATX is a v1 ATX it needs to be included in full into the proof.
   • if both ATXs are v1 malfeasance v1 will create a proof