Start with the source

Look for a promotion page hosted by the sponsor or a clearly identified administrator. A trustworthy listing should link to that original source rather than asking you to rely on a screenshot or a shortened link.

Read the official rules

Rules should explain who can enter, when the promotion closes, what the prize includes, and how winners are selected. If those facts are missing, treat the promotion as incomplete rather than filling in the gaps yourself.

Check the entry request

Be cautious when a promotion asks for payment, account credentials, or sensitive information just to enter. SweepPrize listings are intended to help you inspect the official entry path; the official rules remain authoritative.

If you receive a winner notice

First, confirm that you entered the promotion. Then compare the sender, sponsor, and response steps with the official rules, and contact the sponsor through an independently found official channel if anything is unclear. Do not pay to claim a prize or share financial information just because a notice asks you to do so.

Source: FTC: Fake Prize, Sweepstakes, and Lottery Scams; Fraud.org: Prizes and sweepstakes scams

Sources