#Bitcoin miners receive a reward for mining. The reward includes a block subsidy and transaction fees.

The block subsidy is fixed. With every block, new coins are added to the economy. This subsidy decreases every 210,000 blocks (~4 years) and is guaranteed for every block that's mined.

#BTC transaction fees are purely based on market supply and demand for blockspace. Sometimes they go higher, and other times they drop significantly.

When transaction fees go up, the reward for mining can increase significantly.

For example, the miner for block 828750 received a 0.265 BTC transaction fee + 6.25 BTC block subsidy, so 6.515 BTC ($280,486). The block only had 948 transactions, and each transaction cost ~$1.40.

The miner for the VERY NEXT BLOCK received the same block subsidy but received a MUCH higher total transaction fee. Fees jumped to 5.514 BTC! The miner for block 828751 received a reward worth 11.764 BTC ($506,179) - almost double! The block only had 585 transactions, and each transaction cost ~$33!

If you wait a few hours to transact, fees will likely drop back down.

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