Hey #nostr community

I’ve been offline for about 10 days, who can tell me more about nostr:npub15dqlghlewk84wz3pkqqvzl2w2w36f97g89ljds8x6c094nlu02vqjllm5m and nostr:npub1qny3tkh0acurzla8x3zy4nhrjz5zd8l9sy9jys09umwng00manysew95gx situation, as well as about 10 mining pools having one single custodian?

Really eager to learn here.

Thanks in advance