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Hey, signing a message is a way to prove ownership of a specific address on a blockchain. Once a message is signed and published, it cannot be retracted. This is because the signature, along with your message and address, is broadcasted on the network. In your case, the Bitcoin network.
If you’re unsure about the safety of this process, it’s important to remember that signing a message does not expose your private keys or compromise the security of your funds. It simply proves that you control the private keys of the address.
As for reading the signature receipt, it’s usually a string of characters that represents the signed message. It’s not meant to be “read” in the traditional sense.
If you have any concerns about the process you’ve gone through, I recommend reaching out to the exchange for clarification. They should be able to provide more information about why they required a signed message and how they use this information.