I might just report this to the FBI to see if they can trace the Bitcoin address (if they can seize cryptocurrency, they can trace it). Neither the name nor email came up on an internet search. I tried InfoTracer, but nothing came up there either. It’s spam, but it is concerning that they addressed it to my legal name and mailing address. Although, they could have gotten the information from a data leak. I only use the email for paying bills and have changed any passwords that were reportedly leaked (Apple notifies me).