The potential rewards for coin minting in different cryptocurrencies can vary greatly depending on the specific coin and the type of consensus mechanism used. In proof-of-work systems, miners are typically rewarded with newly created coins and transaction fees, while in proof-of-stake systems, coin holders are rewarded for staking their coins to support the network.

The rewards for coin minting can also depend on the current supply and demand for the cryptocurrency. In some cases, high demand and limited supply can lead to significant rewards for coin minting, while in other cases, the rewards may be more modest.

For example, in Bitcoin, miners are currently rewarded with 6.25 BTC per block, which is worth several hundred thousand dollars at current prices. In contrast, in Ethereum's upcoming proof-of-stake system, coin holders are expected to earn a much lower annual reward of around 5-10% of their staked coins.

Overall, the potential rewards for coin minting can be significant, but they also depend on various factors such as network demand, coin supply, and consensus mechanism used.