bear witness vs countersign

bear witness

• To deliver a testimony, especially as witness 

• To prove, demonstrate 

countersign

• To add a second signature to a document, affirming the validity of the signature of another person. 

• To sign on the opposite side of (a document). 

• A second signature added to a document to affirm the validity of the signature of the first person. 

• The response to a sign or signal.