Dividing your seed phrase across 3 plates
How to add an extra layer of security (but read the disclaimer below)
Advantage of dividing your recovery phrase
By breaking up your recovery phrase and dispersing it over multiple locations you attain an extra layer of security. If one set of plates gets lost or stolen you still have the other two sets to re-assemble your recovery phrase.
We strongly recommend to secure your seed phrase with an additional passphrase (also known as “seed extension”). Do not store the passphrase together with you seed phrase.
Important disclaimer: while dividing your seed phrase across three locations increases security, it does not mean this method (like any other) is a hundred percent secure. Especially if your seed phrase is less than 24 words, the missing words can be brute forced (guessed) by a sufficiently powerful computer in a reasonable amount of time. For this reason you should only store each set of plates with someone that you trust.
If one of the plates with your partial seed phrase gets stolen or is missing, transfer your funds to another wallet (with another seed phrase) immediately!
How to break up your recovery phrase
To divide your recovery phrase across three sets of plates, engrave two-thirds of the recovery seed on each set of Hodlinox plates. This way one plate is useless but any two plates can be used to recreate your wallet.
Example of how to divide your seed phrase across three sets of plates:
12 word recovery seed
Plate set #1: words 1-8
Plate set #2: words 5-12
Plate set #3: words 1-4 and 9-12
18 word recovery seed
Plate set #1: words 1-12
Plate set #2: words 7-18
Plate set #3: words 1-6 and 13-18
24 word recovery seed
Plate set #1: words 1-16
Plate set #2: words 9-24
Plate set #3: words 1-8 and 17-24