Sorry for being paranoid.Please answer
Signatures are part of Bitcoin. Short answer: it's safe.
If you think it can be cracked,
this address holds 53,880.0574758
BTC ($140 million) and has
signed this message.

, that's a lot of BTC and expected GBs! 3340.5635634996GBs and $2,839,479.02897466 worth of it (at 1GB = $850) to be exact.