Determine if a Bitcoin wallet address is "valid"

Question

I know it's possible to verify Bitcoin wallet addresses with Regex (^[13][a-km-zA-HJ-NP-Z0-9]{26,33}$) - but this is not 100% accurate and allows invalid addresses to be detected as valid.

Is there publicly available C# algorithm that can verify bitcoin wallet addresses? I've been Googling for one, but couldn't find anything.

Answer 1

Yes, the Bitcoin-Address-Utility project is an open-source C# tool that includes this kind of verification. In particular, look at Casascius.Bitcoin.Util.Base58CheckToByteArray().