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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.
The user value indicates the MySQL account to which the GRANT statement applies. To accommodate granting rights to users from arbitrary hosts, MySQL supports specifying the user value in the form user_name@host_name. If a user_name or host_name value is legal as an unquoted identifier, you need not quote it.