Unfortunately I haven't found much information about all that thing you asked in the web, people seems do not use it a lot, but let me show you some press release being done already - https://www.prnewswire.com/news-releases/spacechain-and-biteeu-partner-to-enhance-security-and-data-protection-through-space-based-data-backups-300863374.html
I would recommend this site for buying and selling Bitcoin Cash (BCH)
https://local.bitcoin.com
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Hi! I am using the Biteeu platform and its nice for me! I was waiting for 6 month to pass the Binance verification and Biteeu have done it in 10 minutes!
They are making a lot of giveaways i thing you should check them by yourself