Are received BTCs really mine?

Are received BTCs really mine?

when somebody send me BTCs I recognize that by seeing a transaction output is equal to my address. But how can I be sure that it's really me and only me who can spend the output?

I can check, I can unlock the output. But consider I'm an evil, I sell BTCs to somebody. But I create a multisign-script wich unblocks the transaction output also by my private key and when I receive $ I take my BTCs back.

Is there a protection against this? Do wallets check the output scripts somehow before claiming the balance?

http://ift.tt/2BOpasT

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