Bitcoin Seed Security Analysis

Jameson Lopp
Nov 24, 2018 · 1 min read

An Anonymous Bitcoiner writes:

I’m trying to balance the concept of seed protection/memorization with seed entropy. I have added 10 random words to my seed (that my kids have memorized), along with deletion of the last seed word (which my kids have also memorized). I now intend to save these 33 words in plain sight… making them publicly available, to ensure they aren’t lost and forgotten. My question to you is, how safe is this wallet?

It’s always fascinating to see the custom cold storage solutions that folks come up with… so if I’m understanding it correctly, this is the proposed setup:

  1. Generate a 24 word random seed phrase
  2. Random insert 10 other words throughout these 24 words (I’m assuming they’re BIP39 words, otherwise they will stick out like a sore thumb to anyone who knows BIP39)
  3. Remove the last word (which I assume is the real last word, not a randomly added word)

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Jameson Lopp

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CTO at https://keys.casa, Creator of http://statoshi.info, Founder of http://bitcoinsig.com, Find me at https://onename.com/lopp

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