Question1:
It's not official pool.
Question2:
It depends on how much HAC / how many blocks that miner has mined.
First there's the standard blockchain confirmation, just like Bitcoin. That takes 5 min max.
Then, there's the pool settlement software that handles how and when to pay out miners.
The WP says this: At present, the rules for mining pool settlement and automatic coinage are: every block excavated counts a statistical period, and settles once, and the mined coins are distributed in proportion to all participating computing power in the period. If there are more than 2 reward shares, 10 blocks will be credited into the account in 50 minutes, 0.2 blocks will be credited in 8.3 hours, and 0.02 blocks will be credited in 3.5 days.
The more blocks that you mine the faster your coins will get confirmed and paid out.
Question3:
delete hacash_mainnet_data
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1) Thanks for that clarification! I found is that the wallet creation page of hacashpool (wallet*hacashpool*com) is NOT secure, but
https://wallet.hacash.org/ is. They look almost the same, so watch out! Don't know how that affects the credibility of hacashpool

2) I got paid, seems like payment is carried out 1x per day by the pool
3) I already did, no difference, it just starts at block 1 again (tried to mine HAC and HACD solo). I seem to solve already mined blocks and get 0 HAC for it before moving to the next already mined block. Problem is, increasing block number = longer time to solve because of difficulty, so my PC needs more and more time to catch up to the actual block (needed an hour to get to 3,000, actual height is ~170,000) because it solves them instead of downloading the blockchain. In a video tutorial on vimeo (
https://vimeo.com/459491570) the blockchain gets downloaded first. This is not the case on my 2 independend computers (Windows and Ubuntu). I'm using the newest releases from GitHub.