I received an email from Blockchain.com saying I can earn 8% annually by holding BTC.
This seems too good to be true.
You should read the whole FAQ to understand that "
clickbait" email.
Here's their earn page:
https://www.blockchain.com/earnSince you're asking about the passive reward for simply hodling BTC, your rate will only be 0.65% annually. (
readjust per month)
The 8% in passive reward is for other Altcoins.
There is a maximum of 8% rate in BTC but that's for Active Rewards which requires you to do something to reach that highest rate.