FR: blockchain checks

[mgaulton]

I"ve been using the below to look up blockchain addresses when we get randsomeware/extortion type issues.
https://www.bitcoinabuse.com

[mitchmoser]

I've given this some thought and I understand the use case.
However, in order for me to implement this, I'd like to start with at least a couple more sources since it would involve creating a new top-level "IoC" window and I don't feel like that is necessary for adding a single source.
I looked into it and found an additional site that may also be helpful: https://bitcoinwhoswho.com

If we can get a list of a couple more resources in this area, I don't mind submitting a PR and closing this issue. Otherwise, I'll just leave it open for others to contribute additional sources.

Thanks for the suggestion!

[mgaulton]

Right now, all my sources point me just to those two. Nothing else seems to fit into that niche.