I trust this guy : https://media.ccc.de/v/thms-26-cryptography-of-killing-proof-of-work https://media.ccc.de/v/thms-26-cryptography-of-killing-proof... And he'

I trust this guy : https://media.ccc.de/v/thms-26-cryptography-of-killing-proof-of-work https://media.ccc.de/v/thms-26-cryptography-of-killing-proof... And he's behind the crypto of GNU Taler and Polkadot