SWOG (formerly the Southwest Oncology Group) is a National Cancer Institute (NCI)-supported organization that conducts clinical trials in adult cancers. It is one of five "network groups" that make up
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 0x8f89f77385fcbf4eee477283592eab6cdb0342a7eac8156a5f138d3547918ae9. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a4877f3-78a5-4031-9456-d264ab6660f6.json and https://artists.proofprofile.net/proofs/artist/3a4877f3-78a5-4031-9456-d264ab6660f6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).