Nice, but Block will still see every transaction you make.
nostr:nevent1qqs2pv58f5wuxlmccpnl9x9cs2jdd059tgugvgsuwwkljtny6k96k0spp4mhxue69uhkummn9ekx7mqzyzprg8ug9dh2hnft5lc7ly92m9su7p6279deaaz2p8ua928ml0n2yqcyqqqqqqgny38r2
BitKey/Block hold one of the keys to every wallet. They help you sign under certain conditions, but to achieve this, they have to know about the entire wallet setup.