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1. BIP-39 and the concept of seed phrase validity

The majority of generated phrases consist of 12 words, less commonly 24, and much less frequently 15 words in the BIP-39 format, which is the most popular today. Let's take a look at the software for searching seed phrases - (click the spoiler)
[spoiler]https://github.com/xssis/seed-parser

The program performs a recursive search for cryptocurrency wallet passphrase phrases within files, checks their validity (i.e., outputs only those phrases that comply with the BIP-39 standard), and displays the passphrase along with the path to the file where it was found. Validation of phrases for compliance with the BIP-39 standard is carried out using a library from the repository of the Trezor hardware cryptocurrency wallet.

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A fairly standard solution. The author's seed phrases are considered valid only if they comply with BIP-39. It's clear why:
a) simpler validation code, with many implementation variants available in the public domain,
b) most wallets indeed use BIP-39,
c) filtering in this format avoids producing tons of garbage from random word sets, which some file-grabbing software often struggles with.

There is much less competition and a higher chance of finding significant sums if you work with invalid phrases, which are less appealing to those who focus on profits from EVM networks and discard phrases whose balance checks are challenging.


Distributed seed phrases. The goal of profiting is to catch noobs by charging for gas fees (auto-withdrawal)
 The check will show invalidity with respect to BIP-39. Others will be discussed below.
Variants of brainwallets in one form or another are still used, where the source phrase can be anything, not just words from a strictly approved list


Seed phrase from arbitrary words

"QWERTY ..." has become a working seed phrase for a modern wallet on a popular layer-2 blockchain, meaning the addresses linked to it in blockchains (BTC, ETH, ATOM, etc.) are generated and displayed in the interface. Here's another example:



 A mnemonic of even 26 words, or even 29.
What does this mean in practice? If the checker is "standard," it will consider all the listed mnemonics invalid and discard them (as described above).
Conclusions: (1) Invalid phrases should be set aside in a separate folder for further processing; (2) Phrases that are invalid under BIP-39 but resemble mnemonics need their own classification (yes, there’s plenty of outright garbage that can simply be deleted).

 If you want to continue, your activity is the best motivation