21 millions. It would be around 12 millions after the first 6 months.
This is not true, this coins source is based on XZC's source where a big error in the code allowed "hackers" to create an arbitrary number of coins for themselves using malicious zerospend transactions.
https://zcoin.io/zcoins-zerocoin-bug-explained-in-detail/
You can't really tell how much coins where maliciously generated, until you do some investigations with the block explorer but probably a lot
i have gone throw the block explorer block by block from the date of the where the hack was announced.
I guarantee that there no abuse and Zoin is totally safe from the hack of double spending.
After the new release made the 23 Mars the bug was fixed.
And another release is scheduled for May the first.
Can you regard reopen your Pool for ZOI again.
Best Regards
Spirea