hodlpleb (nprofile…r5ta) has the right of it. If you post the hash of your prediction, that note is going to be signed by your key, proving that you indeed posted it. Then you can post the text used to create the hash once your prediction comes true, which will be signed by the same private key, and you can reference the original post containing just the hash, too.
Bonus points if you also use open timestamps to prove you wrote the note on a certain date, since you can create a note with an arbitrary timestamp on Nostr.
Dikaios1517
npub1ku…v3lhe
2025-02-02 06:38:44
in reply to nevent1q…2r80
Author Public Key
npub1kun5628raxpm7usdkj62z2337hr77f3ryrg9cf0vjpyf4jvk9r9smv3lhePublished at
2025-02-02 06:38:44Event JSON
{
"id": "ff4ab64de38e095f44a11594f29c7fa95d0268eaeb8503e50d21c13f6c099eaa",
"pubkey": "b7274d28e3e983bf720db4b4a12a31f5c7ef262320d05c25ec90489ac99628cb",
"created_at": 1738478324,
"kind": 1,
"tags": [
[
"p",
"9f0bbd5b4dc7547496fcdb00feb631af638171e01e58e785b5dfd411779b33f6",
"wss://eden.nostr.land",
"mention"
],
[
"e",
"ea7ff4abf4feeb1098632b7c435546e0a39d5b063670d31e30de4874003892cf",
"wss://a.nos.lol",
"root"
],
[
"p",
"988f12f72c4819b5d011ee70d881356a5ad16c9a1ca22a66530ac72eb1d501ea"
],
[
"r",
"wss://dikaios1517.nostr1.com/",
"write"
],
[
"r",
"wss://filter.nostr.wine/"
],
[
"r",
"wss://nostr.wine/"
],
[
"r",
"wss://relay.brightbolt.net/",
"write"
],
[
"r",
"wss://relay.brightbolt.net/inbox",
"read"
],
[
"r",
"wss://wot.brightbolt.net/"
],
[
"r",
"wss://relay.primal.net/"
]
],
"content": " nostr:nprofile1qy2hwumn8ghj7etyv4hzumn0wd68ytnvv9hxgqgwwaehxw309ahx7uewd3hkctcqyz0sh02mfhr4gayklndspl4kxxhk8qt3uq093eu9kh0agythnvelv9er5ta has the right of it. If you post the hash of your prediction, that note is going to be signed by your key, proving that you indeed posted it. Then you can post the text used to create the hash once your prediction comes true, which will be signed by the same private key, and you can reference the original post containing just the hash, too.\n\nBonus points if you also use open timestamps to prove you wrote the note on a certain date, since you can create a note with an arbitrary timestamp on Nostr.",
"sig": "aa29c3f59ba1bda85283490669156dbc65b1b3b96ec878d35c2ea2ae0284bc585fdb2d5791671948905540a9cf7d47e1907e1d422775c6d32c2c88e1ccc313b6"
}