Stormbringer is a magic sword featured in a number of fantasy stories by the author Michael Moorcock. It is described as a huge, black sword covered with strange runes, created by the forces of Chaos.
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 0x2de0ea1f1004e722d1a742950f9fc82fc4d290e9505bde703a9ab7b0d8ce5773. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab2d456c-d2bf-4cd5-921b-aebbf0e9d023.json and https://artists.proofprofile.net/proofs/artist/ab2d456c-d2bf-4cd5-921b-aebbf0e9d023.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).