One known cataclysm that could make the whole interruption of all the telecommunications but also every electricity network is a Major big Solar storm that hits the earth!

 But what about Bitcoin..? In such case the bitcoin network would be paused, not all at once., some nodes before others.. Gradually, following the interruption areas of the internet!
 However, after all is reestablished, the normal life resumes and Bitcoin actors want to relaunch the Bitcoin network..  So first: not everybody have the same copy of the blockchain as some nodes continued recording after the others got interrupted !  And what if some entities wanted to fool the word creating completely artificial blocks and adding them to the blockchain ?  How to trust a copy of the blockchain then ?  Do all late copies should not-trusted/canceled ??


 So what of a code would be part of Bitcoin protocol and that would depend on that the network is running that could sign blindly the blocks.. (Putting like a seal on them), include in the blocks a cryptographic signature that works like authentication signature ?