Actually, there is a cryptocurrency for that: https://www.usenix.org/system/files/conference/woot16/woot16-paper-wustrow.pdf https://www.usenix.org/system/file

Actually, there is a cryptocurrency for that: https://www.usenix.org/system/files/conference/woot16/woot16-paper-wustrow.pdf https://www.usenix.org/system/files/conference/woot16/woot16... It uses the outputs of the key exchanges as proof that the attack was carried out. I doubt anyone uses it in practice though.