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 0xe1b94a0e56cca6b711a927aebeb4a83377438e7a3d429eeedeafded19c2ddbfa. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f35949a-dc45-492a-9130-ad03937604b0.json and https://artists.proofprofile.net/proofs/artist/4f35949a-dc45-492a-9130-ad03937604b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Choral Music - Bainton, E. / Thompson, R. / Mozart, W.A. / Casals, P. / Mendelssohn, Felix / Parry, H. / Durufle, M.
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 0xa3cbfad93548ac0f8e1e8b974ee4caf93c3828abb739249e602bac4a0652eec0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USASX0830002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3365fbaa30cc72cc16a1972bc4d90a476142bff243808ea7a171e5c35959b2b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USASX0830005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cde6134306123c548508e408a8b7e300638ac684ce0d6add10377e0004b299. 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/USASX0830004.
Durufle, M.: Requiem / Mass, "Cum Jubilo" / Notre Pere (Voices of Asension Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ac0f8fe0c7cba55f2d23e39a296bd3028ee21a7b7db218f57fc9ea2767cc14. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USASX0616901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0119b0f5d72e18939c75e2c13b355e2d8e3f9e1b9d5a5d87f138fb54678894bc. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USASX0616902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf91b0bce0bf0f882f003399cb71afe9ef931e8ed4a80157f530d4f0991c278. 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/USASX0830001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc334ff9781d5b068f4f79a86f1f37c8f0b12c815c23f5ae3250d3df231f021a4. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/USASX0616909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74766bd8c2cd5305f4d0c68cf221515006845e4b53c50cee40808d9f2c5888fb. 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/USASX0616915.
Vesperae solennes de confessore, K. 339: Laudate Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16a7ae67c19e61bd4e27cd48e616965480cd611ec49b438db8fc427b1f872a3. 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/USASX0830003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed0dcb0a73d40c997294a274384baa5b029e99b238d4955563e47ff6adb7680. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USASX0830006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b920fb6206d4957d10c5c6109bb28b1f52b10b7265ca0ca41321e0afe7d74c. 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/USASX0830009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55873fa395f542aebbed48bcc99aed6226b2d4432d3b966330bfc914cbabc7b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USASX0616907.
9 Sacred pieces: No. 7. Blazheni, yazhe izbral (Blessed are they, whom Thou hast chosen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697b55122b14b3e5c6d5ad0e0476d576689192106b8ecc2676a0f9be79fb9b65. 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/USASX0830012.
3 Latin Motets, Op. 38: No. 3. Beati quorum via
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e57c9bcad6696f177a7acf4a98aed80404ddba3c3c044b1682679da10a9381. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USASX0830014.