"Thank you for your interest, I will be happy to discuss my penetration testing services with you. Please PM me with your contact information and a brief description of your web application, and I will get back to you as soon as possible. Else i can give you my WhatsApp.
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I use Linux as my daily driver and it looks like PGP or SSH private key rather than Bitcoin private key. For now, i only can recommend you to jog your memory about when or how you obtain that private key.