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It is extremely hard and unlikely to happen unless some malwares capture your key when you were saving it or access your computer. Also your dog, rabbit or a close friend can mess with the thing where you stored your key :)) It may be a piece of paper, a hard drive, or a wallet like a trezor wallet https://trezor.io/

nice one. this article and this answer has became very valuable content for all readers.

Thank so much for the feedback :) this is what can make me moving. Cheers

you keep posting i keep feedbacking. deal :)

Deaaaal :))