I'd encourage anyone thinking of purchasing this not to.<p>Reasons why:<p>1) Is this audited or reviewed by the community? Likely not (there's no verifiable evidence of it).<p>2) Managing keys is _really, really, really hard_. We have GPG, Age, Keybase, Keys.pub and a slew of other platforms and projects to help us do this and we still cannot get it right; a $15 eBook to teach you "The proper and safe way to hold cryptocurrency" is not going to solve that. Read up on the slew of free and audited information about cold storage and hardware wallets.<p>3) "How to invest in Bitcoin and other cryptocurrencies". Financial advice like this is a bit of a red flag. Again, free audited information available.<p>4) "How to stake your cryptocurrency for passive, residual income". This is again financial advice (you have to buy something to stake) and even if my yield of units of X goes up that doesn't necessitate the price of that yield going up.<p>This is a quick-fast attempt to get some free money from an unverified source, on a platform to easily churn-out sales (not necessarily a bad thing but an indication of low effort) to people who will fall for it.