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The more basic article on Bitcoin Addresses may be more appropriate. A Bitcoin address is a 160-bit hash of the public portion of a public/private ECDSA keypair. Using public-key cryptography, you can sign data with your private key and anyone who knows your public key can verify that the signature is valid.
If you entered an address for a different type of coin, then there are sometimes solutions to retrieve your coins. Bear in mind that these transactions will still be valid transactions, so in this example, there will indeed be Bitcoin that has been correctly send on the Bitcoin network. Thus, these cannot be reversed. The problem is that you don't have access to the address on the Bitcoin network to actually access the coins! Example The following uses the example of you entering a Bitcoin Cash address when you should have entered a Bitcoin address.