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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b786334ee0b60fedbfb97cf0577efc01189df9464d9bd8dfab4d2846637985a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/864f8a94-459c-4c59-8aa6-9252e0b3f24e.json and https://artists.proofprofile.net/proofs/artist/864f8a94-459c-4c59-8aa6-9252e0b3f24e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cfc2a523d3633f40f91beca569c187d97e4fb3ab6b06dc630207cb302b0a91. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DEXO52477023.
Tangos Inolvidables El Ruiseñor de Las Calles Porteñas (Remastered 2025)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c75e98da94862e8c14cea14fb29c671291c6ab47de827379963682451943df5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ART340900574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1b5ad10829f1f4a50ce06b04c935e29ec020fbc499f151465a88a0390844f1. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/ART340900575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82315857b0d6bc6061f48b6667215d0faeb7369cf38775437c0c93786c8c58a7. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:33:51Z), 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/ART340900596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3966deef155d4a61d8b6515d9e135de1ba843700f72c4c73988c484e297d462e. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/ART340900576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6d050e846b3e4bc3265f5aeb7c1fae7096f3d52dc4cd483ad42993366837b5. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T18:52:51Z), 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/ART340900597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8ea5fc40f57d54227a4aeedcf7edf24d943fc33f145537c3930f7208bf14be. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/ART340900578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772a858647af10550817329bb6647e5f682de1cd95115b517bbbb3c29999dd62. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ART340900579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a52c6d9c30aec279b86e8e28123c4a06e3508400d2b7c6447021255b6ffff1c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ART340900581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeccaebf640c06a3ef5c3f62fea50fdc645338d4b77b26c5946c05390954f5b6. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T23:59:24Z), 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/ART340900584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1032274196c13eb6884edacbf92d48c441759d8edfec69357ee78410679e1b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ART340900588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a51229cd6fd7bde1ecae1d48e439bb9e1e26fc4437f4e7b185e99743367c0c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ART340903150.
The History of Tango / Angel Vargas / Recordings 1928 - 1938
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f86af3091dd8c3ef1fd120944bce1d3bbe9c7700a704b215454d0d2ea5b296. 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/QM4TX1521216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11337e2c8a4cb1643480442a3f049b26c7a1da26a600c693ed2c94f4aa115153. 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/ESA011631254.
Argentina!: Tango Legends from Gardel to Piazzolla
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c42dcd4cec861bef38f7601269dd84f9718cf3dc9e11aa3286c600383d6257. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/FRZ333309180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e718470409d4ba552747a0ee7e85bf4aa2233a5f2bfb42ab89f4001eb9ad98. 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/ESA011631269.
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