You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
And if you don’t want to tweet some cryptic stuff, you can use a time stamping service and prove that your prediction happened at that time.
You can do sha512 online at https://sha512.online/ Type your prediction or whatever you want to prove in the text box, and press the "Generate Hash" button. The Sha-512 output is valid only for that particular text you have types. Save the text you entered in your local disk.
After a year, you can tweet the actual text and others can verify that the sha512 matches, thus proving your prediction.
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