Reward in case of fork Hi I would like to ask you guys for some details about getting reward from minning block when there is a fork - two miners get different blocks at the same time. Both of these block will have the coinbase transaction. Does it means that both of users wallets will have information about this transaction? If yes what will happen when both users will quickly go to bitcoin's ATM and take fiat currency from this reward?
Does it means that both of users wallets will have information about this transaction?


Both miners will see their own coinbase outputs in their wallet software, yes. However, the two coinbase transactions will be separate.


  If yes what will happen when both users will quickly go to bitcoin's ATM and take fiat currency from this reward?


They cannot do this. Coinbase outputs are immature, and unspendable, for 100 blocks. After 100 blocks, a fork should ideally be resolved already. If it is not resolved, then only the miner on the same side of the fork as the ATM operator will be able to access his coins, as the ATM will not be aware of the coins on the other side of the fork.