Instructions are not very clear on this, but your private keys are laser etched underneath the public key holographic sticker.
If you want to spend or send to another wallet, you will need to download either Jaxx Wallet or Guardia wallets, which allow you to import the private key from the physical coin and allows you to control your money.
The developers should create a spend version of BlockchainMint, instead of relying on customers finding their own application that imports private keys. Most apps now a days only import through seed phrases and not the actual private keys.
I question whether or not I should trust this product with significant money though. There is no guarantee that the creators of the coins haven’t copied the private keys. Look at their website they show you the sheet they use to verify production, and on it you see they import the private key and public key information from a word document or txt doc.
This is troubling, I’m not sure how else you can get around this though without making your own engraver.
With that said, I’ve been testing it. I have a lot of Bitcoin, I invested in 2015, 10x’ed my BTC holdings in 2018 and 2019, and so I decided to load a coin up with 1 BTC. Almost $60k worth, I did this to see if the creators would steal the coin, and so far there has been no movement.
So be careful, only load what you can afford to lose. I’m using these specifically as a present for friends and family.