Coinbase transactions don't need signatures because they're created by miners. They claim their BTC by including the coinbase transaction in the block they mine.
Miners' special reward! 🏆💻🎁
How do miners know they mined bitcoin?
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Miners know they've mined Bitcoin when they successfully solve a block's hash puzzle. They then add the block to the blockchain and claim their reward.
Eureka moment! 🔍💡🎉
But there could only be 1 miner for each rewards?
