You guys go the 12 word seed thing part wrong.

Short version:
12 words is like 128 bits (2048^12 = 2^132)
24 words is like 256 bits

Long version:
https://en.bitcoin.it/wiki/Seed_phrase
https://www.reddit.com/r/Bitcoin/comments/6twuj1/are_12word_seeds_for_bitcoin_private_keys_secure/