Say I want to invest $100,000 in BTC today. I wire the funds to Coinbase (or any place that handles this stuff). How much does it cost to get my position on the Blockchain with my private key and how soon would that be done? Not interested in new and upcoming things, so today.
The main expense of doing that would be buying a hardware wallet device and paying the Coinbase trading fee. Moving the bitcoin from Coinbase to the blockchain would only cost a dollar or two.
The hardware wallets range from $50 to $200. If you were to buy the bitcoin using Coinbase Pro rather than Coinbase, the fee is something like 0.50%. So, say $600 to $700 or so. The main Coinbase charges 3% or so to the newbie customers.
I am not sure about the time to get onto the block chain. If you had the bitcoin on Coinbase the transfer would take 10 minutes for the first block to be made, then usually it is considered to wait for 6 more blocks to be sure everything is all settled. So, say an hour.
However, I think Coinbase will put a hold on your deposit for some number of days before they allow you to remove the bitcoin from your account. They should allow you to buy it as soon as your wire transfer arrives. Maybe with wire transfer they have less of a time limit than ACH, but I don't know about that.
Ordering a hardware wallet from the manufacturing company would take a week or so, depending on shipping and supply chain issues. If you were willing to risk a software wallet, setting it up would be same day.
You would also have to set up your account and do the know your customer stuff. I have heard that Coinbase is pretty quick, but have seen people complaining of some other exchanges taking weeks to approve due to staffing shortages.
Also, with that amount of money, it would be prudent to spend some time learning and practicing with your hardware wallet to make sure you don't have an issue doing the transfer.
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