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Kaspa Q&A

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Kaspa Q&A Fees and VSPC(Virtual Selected Parent Chain)

No, in Kaspa each blue block receives a reward. The main reason is that rewarding only chain blocks (VSPC blocks) creates incentives for selfish mining. But there are other (milder) advantages to ...

posted 10h ago by someone235‭  ·  edited 7h ago by someone235‭

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#2: Post edited by user avatar someone235‭ · 2025-10-02T18:20:03Z (about 7 hours ago)
Explain reasoning
  • No, in Kaspa each blue block receives a reward. Due to some technicality that is [explained here](https://mikezak.medium.com/dags-are-hard-i-want-my-chain-back-69b67a5f2c05), the payment to the blue blocks is not done by the blue blocks themselves, but by the coinbase transaction of the chain block (VSPC block) that merges them.
  • But there are other advantages to being a VSPC block:
  • 1. In GHOSTDAG ordering, it precedes any block in the same mergeset - therefore, if two blocks in the same mergeset have the same transaction, the chain block will receive its fees.
  • 2. If it points to a red block, it will receive its reward. This rule has an exception: if the red block is outside the difficulty window, its reward will vanish (see more info [here](https://qa.kas.pa/posts/20))
  • No, in Kaspa each blue block receives a reward. The main reason is that rewarding only chain blocks (VSPC blocks) creates incentives for [selfish mining](https://decentralizedthoughts.github.io/2020-02-26-selfish-mining/).
  • But there are other (milder) advantages to being a chain block:
  • 1. In GHOSTDAG ordering, it precedes any block in the same mergeset - therefore, if two blocks in the same mergeset have the same transaction, the chain block will receive its fees.
  • 2. If it points to a red block, it will receive its reward. This rule has an exception: if the red block is outside the difficulty window, its reward will vanish (see more info [here](https://qa.kas.pa/posts/20))
#1: Initial revision by user avatar someone235‭ · 2025-10-02T15:05:27Z (about 10 hours ago)
No, in Kaspa each blue block receives a reward. Due to some technicality that is [explained here](https://mikezak.medium.com/dags-are-hard-i-want-my-chain-back-69b67a5f2c05), the payment to the blue blocks is not done by the blue blocks themselves, but by the coinbase transaction of the chain block (VSPC block) that merges them.

But there are other advantages to being a VSPC block:

 1. In GHOSTDAG ordering, it precedes any block in the same mergeset - therefore, if two blocks in the same mergeset have the same transaction, the chain block will receive its fees. 
 2. If it points to a red block, it will receive its reward. This rule has an exception: if the red block is outside the difficulty window, its reward will vanish (see more info [here](https://qa.kas.pa/posts/20))