I am currently poking around the cardano explorer API and found that for each CBlockEntry, there is a field called cbeBlockLead. https://cardanodocs.com/technical/explorer/api/
I assume this would be the address(?) for the slot leader.
I tried to tally up how many distinct cbeBlockLead we have since epoch 1, and surprisingly, only found 7 of them, with evenly distributed # of slots led.
Does that mean we currently have only 7 machines processing all transactions, and when staking is opened, we will see more ?
cbeblocklead | count
af2800c124e599d6dec188a75f8bfde397ebb778163a18240371f2d1 | 86737
6c9e14978b9d6629b8703f4f25e9df6ed4814b930b8403b0d45350ea | 87448
1deb82908402c7ee3efeb16f369d97fba316ee621d09b32b8969e54b | 86990
5071d8802ddd05c59f4db907bd1749e82e6242caf6512b20a8368fcf | 87362
5411c7bf87c252609831a337a713e4859668cba7bba70a9c3ef7c398 | 87599
43011479a595b300e0726910d0b602ffcdd20466a3b8ceeacd3fbc26 | 87154
65904a89e6d0e5f881513d1736945e051b76f095eca138ee869d543d | 87109