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I have a BTC wallet backup copy in PKCS1 private key format. Sadly, my friend created the wallet for me and I didn't take part in creating it. And I don't know on what platform was it created.To sum up, I have an address of my BTC wallet and this back up file. The content of which I changed for the example. Maybe there is some way to extract the key using Python or Terminal. Thanks!

-----BEGIN RSA PRIVATE KEY-----
MIICXAIBAAKBgQCjcGqTkOq0CR3rTx0ZSQSIdTrDrFAYl29611xN8aVgMQIWtDB/
lD0W5TpKPuU9iaiG/sSn/VYt6EzN7Sr332jj7cyl2WrrHI6ujRswNy4HojMuqtfa
b5FFDpRmCuvl35fge18OvoQTJELhhJ1EvJ5KUeZiuJ3u3YyMnxxXzLuKbQIDAQAB
AoGAPrNDz7TKtaLBvaIuMaMXgBopHyQd3jFKbT/tg2Fu5kYm3PrnmCoQfZYXFKCo
ZUFIS/G1FBVWWGpD/MQ9tbYZkKpwuH+t2rGndMnLXiTC296/s9uix7gsjnT4Naci
5N6EN9pVUBwQmGrYUTHFc58ThtelSiPARX7LSU2ibtJSv8ECQQDWBRrrAYmbCUN7
ra0DFT6SppaDtvvuKtb+mUeKbg0B8U4y4wCIK5GH8EyQSwUWcXnNBO05rlUPbifs
DLv/u82lAkEAw39sTJ0KmJJyaChqvqAJ8guulKlgucQJ0Et9ppZyet9iVwNKX/aW
9UlwGBMQdafQ36nd1QMEA8AbAw4D+hw/KQJBANJbHDUGQtk2hrSmZNoV5HXB9Uiq
7v4N71k5ER8XwgM5yVGs2tX8dMM3RhnBEtQXXs9LW1uJZSOQcv7JGXNnhN0CQBZe
nzrJAWxh3XtznHtBfsHWelyCYRIAj4rpCHCmaGUM6IjCVKFUawOYKp5mmAyObkUZ
f8ue87emJLEdynC1CLkCQHduNjP1hemAGWrd6v8BHhE3kKtcK6KHsPvJR5dOfzbd
HAqVePERhISfN6cwZt5p8B3/JUwSR8el66DF7Jm57BM=
-----END RSA PRIVATE KEY-----

I did a lot of googling and I didn't find the answer if Bitcoin Private Key can contain PKCS1 private key.

Alex
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    Bitcoin doesn't use RSA at all, it uses only ECDSA or experimentally another ECC-Schnorr signature scheme, both on curve secp256k1. And modern wallets (since about 2015) don't even store ECC keys directly, but rather the 'seed' used to generate a large number of different ECC keys when needed, called Hierarchical Deterministic (or just HD) key derivation. So either your friend is really incompetent, or it's someone you 'met' on the Internet who is in fact not a friend but rather a fraud, liar, and thief. – dave_thompson_085 Aug 29 '23 at 23:01

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