From what I recall Crime Stoppers issues the caller a unique code- like a random password generator. They then give you a time to call back to check the status of your tip, and then when it's all said and done you can go in and collect your reward.
Not sure how much stays anonymous; like if they have to testify. But if the police can get a warrant based on a tip, then the search comes back with the murder weapon and DNA, there likely would be a need to testify.
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