You didn't even know what a pgp key was before this convo or read receipts

Lol what? I knew what they were, I just thought it was stupid to bring them up because they solve nothing.

Falsifying evidence is a crime.

Oh, then there is no need to worry about it, I guess.

"why did you not respond",

"Respond to what??"

they're going to pull out their phone and say "see, I sent you this".

Then the worker pulls out their phone and says, "see, it's not on my phone"

That's the contractors fault. Blockchain is irrelevant. If they didn't check their email, they're sure as hell not going to check a dumb ass blockchain.

Unless, of course, the sender/manager actually didn't properly notify the contractor/employee, and now they are lying to cover their ass.

Like many disputes, it amounts to he-said-she-said. When it goes to court, the jury will flip a coin. There is a better way.