I recently recovered a document containing information relating to some BTC I purchased in 2015. I only have: a passphrase/password, an 18 word mnemonic phrase(the majority of which are not in the BIP39 wordlist, nor the electrum old/new wordlists, e.g. mccartney, hopkinton), and the address: 1CfadqyBDRPt62S9UvBHDPtqRu2kSvwPPu. I idiotically forgot to add what wallet I used, so I'm a bit stuck.

Any ideas about what the mnemonic could be for?

  • Answering these kinds of questions are rarely ever free. – skaht Apr 13 '19 at 2:10
  • I understand, I was just wondering if someone else had encountered a similar issue in the past. – Sierra Apr 13 '19 at 2:11
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    That’s a blockchain.info “recovery phrase”, which isn’t a seed and isn’t enough to recover your wallet. – Anonymous Apr 13 '19 at 6:54
  • Remember the 1st four characters of the BIP39 seed words need to remain unchanged to identify what the real BIP 39 seed words are. If this gets you nowhere, read the BIP 39 Standard as to how seed words are used to synthesize entropy. You will note that the entropy associated with different spoken languages leads to wildly different results. Understanding that the effective sha512 hashing a the seed words might provide insights what happens when seed words are misspelled or improperly recorded. However, taking this approach will be very implementation specific. – skaht Apr 14 '19 at 3:34

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