thumb|Rob MacKillop with Deering Banjo in 2013 Rob MacKillop (born 1959) is a Scottish musician and multi-instrumentalist, specializing in lute, theorbo, vihuela, historical banjo, ukulele and classic
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 0x225c5ff6d8af98abfd711601552174f7382691c689cd02e11273254077d6712d. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e133f9f1-9efc-4c94-af22-96b80502f449.json and https://artists.proofprofile.net/proofs/artist/e133f9f1-9efc-4c94-af22-96b80502f449.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fernando Sor - the Art of the 19th-Century Guitar, Volume 1
Tunes from the Balcarres Lute Manuscript
The Romantic Spanish Guitar, Vol. 1: 19th Century
Robert Ross: Select Collection for the Guittar
Love Is the Cause: Scottish Tunes for Viola da gamba & baroque Guitar
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xb22f7b536ba1da269570cf5265ca650f58e545dab4bec12ec828f583af597854. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0953004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2773cdd1dcbc4553941813ac11d6715950f6c9e28608cce27ac131f7013cc25c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0953010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f745d434f58743c20bcb348482c0d829a73b9fe88115bf9be5680d201ecee7. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0953013.