CM or its variants may refer to: Arts and media Gaming Championship Manager, a popular football management simulation game Chessmaster, a chess computer program series Music C minor, abbreviated
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 0x162c179b4d8192197fe437222dd86cce64ceafefe1237eb1c479dd5640dc1de5. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac1ca769-b14b-4985-806d-bd5fce7a8ad9.json and https://artists.proofprofile.net/proofs/artist/ac1ca769-b14b-4985-806d-bd5fce7a8ad9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).