Cheating while mining

Cheating while mining

Consider I'm a miner. I mine on my own, I don't mine in pools. I have power enough to find the hash, lets say, once per 2 years.

When I find the hash within those 2 years I send the block back to the network and since the hash is low enough the block would be accepted and added to the block-chain.

It's up to miners (so me) to check the transaction signatures but the block AFAIK doesn't contain the signatures. How can others within the network can be sure that all the transactions in my block which I calculated were signed?

If I was an evil miner, I could have added a transaction without a signature. How is this prevented? Am I the only one who checks the signatures within my block?

Thanks for explanation.

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