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 0x62005898fd5f6c368cd75848d5c635b2e4517f79717adf5845c2fd682175f6d7. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc79a02e-b47c-4d84-b357-2eb59deb2169.json and https://artists.proofprofile.net/proofs/artist/dc79a02e-b47c-4d84-b357-2eb59deb2169.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cello Arrangements - Piazzolla, A. / Villoldo, A.G. / Gardel, C. / Salgan, H. / Gade, J.
5 Tango Sensations: No. 5. Fear (arr. E. Runge and J. Ammon)
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 0x378b90b46bd5682b3931105c28b04059f1ac88ed6a681fd2c69860f5c9ab23a1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DET900812601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b040dd1b0bfa2871f316c66ec0007ff6643bc37479128c9dc98f6fbbf0ddc27. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DET900812602.
El dia que me quieras (arr. E. Rungel and J. Ammon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930731db6ab6d354bf2027355fc2f765d59852475c1bc883bb5170ca0739b7d9. 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/DET900812603.
A fuego lento (arr. E. Runge and J. Ammon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4f69cf056b92771ff3d2f67db81234f0e01b7c289afaa8639d523e0d50d5f8. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DET900812604.
Milonga del Angel (arr. E. Runge and J. Ammon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa8d770128761eabce3e8b87638f12bd431855b61ac3756faae441143a85cab. 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/DET900812605.
La Muerte del angel (arr. E. Runge and J. Ammon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba380023f93ec8d9d3a161ef4b69c55b517ee9691641fda2ba90b73196f7bd90. 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/DET900812606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe167024038ea1b666cdfa87a15a95d7835edf7e33a87e30772155f1de4a4c1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DET900812607.
Jalousie (Jealousy) (arr . E. Runge and J. Ammon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd02b8d042d139b94c010c54f3cc939355ebd44719c527ccc4296cb6626ec05e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DET900812608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d817e7d93a0240cfc692989cdf8f82b4e1b7d9c7a7d371aaa193728577090c6. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DET900812609.
Maria de Buenos Aires: Fuga y misterio (arr. E. Runge and J. Ammon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd780a7ff0ffb01920cf520c2b310322c9e4533243921ace9523aa1386a5e01c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DET900812610.
Le Grand Tango (arr. E. Runge and J. Ammon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fffacd8ab913f16984d4bca47239a21f8737f4134a4605c94db4a37abc529d. 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/DET900812611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4dde1f4c5f543525fd7b8abc3b7261931e9a792e9ea146046fdd18f1e0fdd8. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DET900812612.