I can't figure why this block has 0 coinbase with 0 transactions... however still a valid block? Or it it empty? According to whalepanda this coinbase was sacrificed by unknown miner.
See the block at height 501,726
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It has no transactions other than the coinbase transaction. However, the transaction's coinbase output is 0 BTC. Here's the valuable piece of information that you are looking for:
Coinbase outputs may be set lower than the max. value (12.5 currently), and the block will be valid (if the difficulty is lower than the target, as always)
BTW, the miner loses money, for the price of being "cool".
Block contains "RSKBLOCK:Ý¿QzßýKÊwQP[9É: ÔyüN9ÝW³GÆ$", so I think that it is related to www.rsk.co. Probably Sidechains synchronization.
Binary hex: "52534b424c4f434b3addbf517adf8ffd4bca7751505b39c9013a0d1fd479fc4e901b39dd57b347c624"