next 10 miners or next 10 blocks?
Next 10 miners...
And as an extra incentive will offer 50 SBC to the first miner to find 10 blocks.
We have to find 10 blocks total?
or
50 SBC for each miner to find a block?
Oh wait, I think you meant 10 per block extra, 50 bonus for finding 10....
The next 10 miners who find a block get 10 SBC bonus each (1 bonus payment per miner).
The first miner who finds a total of 10 blocks gets an extra 50 SBC.