A js program random generate 12 words metamask mnemonic and check the balance in the account.
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ethers
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web3
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bip39
You can run it on repl.it or on your PC.
Just change web3 provider api in line 4. You can use Infura, Alchemy or other web3 provider.
If there's no eth in the account, then mnemonic and address will be record to zerobalance.txt.
Otherwise will record to cracked.txt