For security reasons, the pool uses two wallets: hot and cold.
The funds immediately available for payouts are kept in the hot wallet. This wallet has a relatively low balance for security reasons and when it becomes empty, the pool administrator has to load it from the cold storage – a highly secure offline computer that keeps the pool's coins.
Because of the fact that loading from cold storage cannot be automated and only a very limited number of people have access to the cold wallet, this process can cause a few hours delay in sending the rewards to users' wallets.
Adam
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