For the moment, I haven't submitted the private key (I haven't unpeeled the coin yet) because I want to be sure of the process first.
How much do you trust your macOS and all other software you've installed on it? Do you trust it with €35,000? If not, you should NOT enter your private key and go for a solution that includes offline signing.As long as you haven't peeled the coin, you can take as long as you need to research how to do this.
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Another reason is that I'm hesitating between peeled the coin and convert in bitcoin or selling the coin in the "Collectibles" part of the forum.
What do you think about it ? What's the best solution ? I have searched a little bit on the forum but the opinions are divided.
I'm with Cricktor on this one: it's risky to sell, even though you might get more money for it.What do you think about it ? What's the best solution ? I have searched a little bit on the forum but the opinions are divided.
Sorry but what are the forks ?
Follow the link to Fork claiming service 
But don't believe the values anymore, those days are long gone.My advice: don't worry about them before moving your Bitcoin. People have lost their Bitcoins through scam wallets before. But don't forget about them either, you're currently looking at about $400 extra that can be taken from your private key.