SPG can refer to: Places Albert Whitted Airport (IATA: SPG), in St. Petersburg, Florida Springfield Union Station, Massachusetts, Amtrak station code SPG Springvale railway station, Melbourne, sta
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7894405b42528294ad8e7db7e9b7110896c3b2fd9efef0146660691c57373b2. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b6c5a2b-7da0-41be-a58c-c587058f5eda.json and https://artists.proofprofile.net/proofs/artist/2b6c5a2b-7da0-41be-a58c-c587058f5eda.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).