Regarding the coins transfer from the old to new wallet.
Can someone confirm where these new coins have come from?
I assume from a premined account but where can we verify the balance of this account?
Yes, we premined the new chain in order to allocate coins for the refunds, bounties, exchange fees, etc. 456,000 coins were allocated to cover all the possible previous coin holdings. Any remaining funds for coins not claimed will be allocated for bounties.
The refund wallet transfer was split into multiple transactions, but
http://alloyexplorer.com/?hash=3d001e211e01e91795c1d5a7eeda435cbea2f95d766954f276eaf8b9ed628626#blockchain_transaction is an example of one transfer from genesis into the refund wallet.
Can somebody explain to me why Alloy Explorer is showing current supply of 4,775,475 XAO when only 456,000 coins where supposed to be premined?
Yes. the daily emission for XAO is about 38400 = 80 (block reward) x 24 (hrs) x 20 (3 minute block time)
4,650,000 XAO equivalent to 4 months private mining.
4,650,000 XAO equivalent to ~5% premine. (total supply 84 million XAO)
Since there is a hardfork, the dev team have to pay old blockchain miners 1 month worth XAO. Also the dev team have to pay for listing.
i.e dev team only reserved ~3-4% of total coins for maintenance cost.
You can check that most new cryptonote coins now have over 10% premine.