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I had a wallet years ago on a PC I sold. I mined bitcoin on it and what not. Recently I found a 16 digit passphrase I wrote down for my wallet. That is all I have and probably all I needed. If I only wrote down the 16 digit passphrase that means that's all I probably needed to access it anytime. I'm 99 percent sure I was using bitcoin core but I'm not too sure. What I do know for sure is that I have my 16 digit passphrase. My question is how can I access my wallet with my 16 digit passphrase I got?