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IBAN validation
Strip spaces, move check digits, mod 97 == 1. Does not prove the bank exists.
Back to homeStrip spaces, move check digits, mod 97 == 1. Does not prove the bank exists.
Back to homeMove the first four chars to the end, expand letters A=10…Z=35, mod 97 must be 1.
GB82WEST12345698765432
Length: 22mod 97 = 1 (remainder 1)
Passing checksum does not mean the account exists.