Intro
This Excel app allows you to share your seed words with others without revealing the original seed words. Enter your seed words, then a secret key, and export the result as a plain text file. You can safely share the printout: without your secret key, the result is worthless to others.
What are seed phrases?
- A seed phrase (also known as a recovery phrase) is a list of words that serves as the master key for a crypto wallet. It allows access to all the cryptocurrencies stored within it and can be used to restore a wallet on a new device.
A seed phrase typically consists of 12 or 24 randomly generated words. Anyone in possession of these words has full access to the associated crypto assets. For this reason, the seed phrase should always be kept safe and never shared with third parties.
Important safety instructions
- Write down your seed phrase on paper or another suitable offline medium.
- Do not store the words in plain text on your computer or smartphone.
- Never share your seed phrase via email, instant messaging or over the phone.
- No reputable provider will ever ask you for your seed phrase.
- If the seed phrase is lost, in many cases the wallet cannot be recovered.
Hint
Instead of using this software, you could also do it manually—which is definitely more prone to errors
some screenshots:
Home screen of the Excel app:
When you start please press the button in the yellow header „Enable content“
This is the worksheet you see first after starting the Excel app
Columns A and B are read-only up to cell B2050
form010: calculate the ID-Crypt values - button "1. print ID-Crypts"
program logic
For manual use without the excel app, use the Windows calculator:
Open the calculator in Windows and select „Scientific“ view. The MOD button will then appear
Example: secret key 2345
The first original seed word (in row 11) is: absurd
and has the ID = 8
8 + 2345 mod 2048 = 305
305 is our result (column 3, ID-Crypt)
The number in the ID-Crypt column can now be written down on a piece of paper for each word in column 2
Additional information:
How does the MOD function work in VBA?
https://learn.microsoft.com/de-de/office/vba/language/reference/user-interface-help/mod-operator
Note: The MOD function in an Excel worksheet does NOT return the same results as in VBA!
program notes:
1. When you’re done, click „Reset Entries“ to clear all entries;
then enter the seed values of your next wallet and so on…
2. when finished save the Excel file and close it.
3. It’s best to keep the secret key only in your head.
form020: get the original seed values - button "2. get the original seeds"
frm020: go back and convert the ID-Crypts into the original seed phrases.
Recommendation: do not take screenshots of your original seed phrases. Depending on your Windows settings, screenshots may be saved to a cloud service such as Microsoft OneDrive, Google Drive, etc., thereby becoming a potential target for attack.
It’s a much better idea to write down your seeds on a sheet of paper if necessary.
form901: Info - Help -- button "i"
form901: the info form of the excel app
Extend functionality
Maybe your wallet uses a seed word which does not exist in the BIP39-list of the excel app. You can then add more words to the BIP39 list
This means the mod value increases from 2048 to 2049, and so on.