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 0xf8cdc078240f8e9838ce3ccf13ba19890dd793737fe41158f4cee8a5c95964c5. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8754ab5e-8617-4736-b4aa-d0e23e06e9c6.json and https://artists.proofprofile.net/proofs/artist/8754ab5e-8617-4736-b4aa-d0e23e06e9c6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Alto Saxophone Exam Pieces, Starting 2014, ABRSM Grade 6
Alto Saxophone Exam Pieces, Starting 2014, ABRSM Grade 5
Alto Saxophone Exam Pieces, Starting 2014, ABRSM Grade 3
A:1 Le Petit Chien (No. 11 from The Good Tempered Saxophone)
Saxophone Exam Pieces from 2022, ABRSM Grade 3
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 0xa4db4401ed025d64c851538ff1bf5c3f5e7cc03712e9cb3ee9668e408e4823c9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBEYQ2184201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99847b5e7fcc9e72aa10557968bc2c17021cedddf24aee02bab6697171ccd86. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBEYQ2184202.
A:3 Allegro (1st movt from Concerto in E, La Primavera, Op. 8 No. 1, RV 269)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9a48078918423c399a576d2f418dc4cac14451e1011735072bcd29e62c10e6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBEYQ2184203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c49b5cef21637144e5d465260fde2471017b2bad39917c6ac02c15c8862efa. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBEYQ2184204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d73e8a9da684e23a82b3ec4646380265d5ff170c0b9004e30277ee6c1a9555a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBEYQ2184206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71836665cfb4eea3d4d8da6bb6e6c5f3a6b5943b7b0d8fe44bc9bc77fdcd1df4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBEYQ2184207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211d2f93415c140024c567f0e5331c432bca369f79b77ab368cfec0a88ca4cb3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBEYQ2184209.
ABRSM Saxophone Exam Pieces 2018-2021, Grade 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0184f5825e619af41969affa8fabae0b6d8c1ec0942fcd156bd285d94b0e76. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBEYQ1760701.