Calum is a given name. It is a variation of the name Callum, which is a Scottish Gaelic name that commemorates the Latin name Columba, meaning "dove". It may refer to: Calum Angus (born 1986), Engli
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b9933faac6b102ea6455703c03fd7ce0cc737e4b36813fbe1764594d97ddc7. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c15ff770-6d83-425e-9932-c7e3fd8907a1.json and https://artists.proofprofile.net/proofs/artist/c15ff770-6d83-425e-9932-c7e3fd8907a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).