On January 3rd, 2019 crypto traders will take part in the Proof of Keys day. Thanks, HitBTC, for showing why we should care. — What is Proof of Keys anyway? Proof of Keys is a movement started by well-known crypto investor Trace Mayer through Twitter. On Thursday, January 3rd, 2019 investors are being urged to move their cryptocurrency off of exchanges (Coinbase, Binance, etc.) and into a Bitcoin wallet where they have control over the private keys.