I've read the following document describing mining on the Ethereum network:


Now, the successful PoW miner of the winning block receives 5 ether. Conversely, uncles are rewarded significantly less.

Are two mined blocks with the same parent block both rewarded 5 ether? Or will one of the blocks be an uncle?

1 Answer 1


Let us call these blocks W and L. Both blocks are rewarded 5 ether in the fork for which the block appears as part of the main ledger history. However, eventually, one of the forks will dominate (the one descending from W)-- it has more children -- and the other fork will die off (the one descending from L). If L is included as an uncle block within 6 blocks of W in the chain descended from W, then L will be an uncle and will be rewarded the amount set for uncles.

What this looks like

Assume that W and L are mined by different miners (w and l, respectively) and both have coinbases with 0 ether. I'm using miners and their coinbases/accounts interchangeably in this answer.

From w's perspective

w has 0 ether until block W and then suddenly has 5 ether -- and it stays that way -- then, shortly afterwards, l's balance goes from 0 to 4.375 (or less) ether (depending on when it is included as an uncle). This remains the same until more blocks are mined or new transactions involving the accounts are made.

From l's perspective

w and l have 0 ether until block L; at this point, w has 0 ether and l has 5 ether. At some point, the miner of L's node will sync with the network. w's account will have 5 ether and, depending on whether l's block has been included as an uncle, yet, the balance for l will go to 0 or the uncle reward amount. If it goes to 0, it can rise again once L is included as an uncle block.


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