Looking for the lowest fees to buy bitcoin and then send to cold storage? Follow these steps below:
1) Buy BTC on Kraken Pro (not Kraken, Kraken Pro. Kraken Pro has lower fees than Kraken. Kraken Pro has its own mobile app too so download the right app)
2) Lightning send to @Cash App
3) On-chain send to cold storage via Cash App. No fees if you send over 100,000 sats (no priority)