Keep the proof types distinct
An authenticated actor reporting an outcome is different from a receiving system signing an effect. A provider payment record is also distinct from a 2AYE execution receipt. Inspect the evidence format, trust key and actual effect correlation.
Verify against trusted material
Use the published verification profiles and vectors for their stated format. Pin the expected verification key independently, check the signature and material action bindings, then compare the receipt with authoritative destination read-back.
Read the verification boundary
Reference vectors and implementation tests establish self-consistency. They do not establish independent interoperability, production acceptance or third-party certification. A structural package check alone cannot prove a payment happened.