Select each group of words that contain your backup seed words. Most seed word backups are 12 and 24 words in a specific order. For 12 words you should select (12) groups and you will receive 36 individual keys. Likewise, if you have 24 words you should select (24) groups and will receive 72 individual keys. You will discard the dummy keys and only keep your selected keys in the specific order that represent your seed word phrase.
This is not a full set. Must select a group of (3) words at a time, and add to cart, then return back and select the next group. So on until all of your words are selected. This is used to build your own backup with pre-selected words. Please do not order your group of words in order. Do it randomly to increase security. You can also order extra groups to increase security as you see fit.
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Please also read the Seed Security Analysis by Jameson Lopp.
A normal 24 word seed phrase which is 2048²³ combinations (it’s not 2048²⁴ due to checksum validity requirements).
2048²³ = 14,474,011,000,000,000,000,000,000,000,000,000,000,000,
Now, if for example if 24 groups of keys are selected this would result in 72²³ combinations.
For 72 words using the group of 3 keys, the combinations is reduced to 5,231,755,200,000,000,000,000,000,000,000,000,000,000,000.
The total total guessable set of combinations (and thus your computational security) has been reduced by 0.0000000000000000000000000000000003% of a normal seed phrase.