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is there any way to know blockchain.com passphrase pattern , I mean they use some words from the dictionary to give someone a passphrase , how would we know the exact wordslist they use ?

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Current blockchain.info wallets use the BIP39 wordlist, which you can find for various languages at https://github.com/bitcoin/bips/blob/master/bip-0039/bip-0039-wordlists.md/

Previous versions have used non-standard implementations with a variety of different wordlists for example v2 and v3.

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  • is there any type of salt they uses at the time of making keypair ? or they just use 12 words passphrase to make the keypair ? Commented Sep 29, 2018 at 4:17
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    Current implementations follow BIP39 and 32, you can read those to see how keys are derived from the words Commented Sep 29, 2018 at 4:18

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