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 0xa7321d5182dddce61984565b3500d4eaddc04821fbce5fccc1c5cfcf6469f898. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/121bf538-0e46-4740-b5b8-556bff36b760.json and https://artists.proofprofile.net/proofs/artist/121bf538-0e46-4740-b5b8-556bff36b760.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mare Nostrum: Gregorian Chant, Troubadours and Motets in Languedoc-Roussillon, France
Un chemin d’étoiles (Chansons des pèlerins de Saint-Jacques du Moyen Âge à nos jours)
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 0xb25fb6fbe48743502da0daebe8bd634e949328bc7471ff7090ad05fc9c000df6. 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/FRZ091500861.
Santa Maria: Chants à la Vierge dans l'Espagne du XIIIe siècle
Cantiga de Santa Maria 79: Ay, Santa Maria, quen se per vos guia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c0335cb14aa000576206a96e9fa372a84f72d59aaefb7ee567fd7acd36a921. 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/FRZ091600526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8ee9756495770833d3f662da5eb39cd06cf1f4d0c480abbbfcbc1a8900daec. 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/FRZ091600524.
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
Cantiga de Santa Maria 300: Muito deveria ome sempr' a loar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095e235131e47a6146d78938318b90b69c19e6cd4574a15b14925bac9f705bc8. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/FRZ091600525.
Nova Sonet Harmonia: Huitième centenaire des dominicains
Terribilis est locus iste - V: Cumque evigilasset Jacob
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9426ec25d19cfd3d24d0851d00ad38a770e6b59678bd2677b8aae91d6f8200b2. 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/FRZ091800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8a9bee4840c16323d384fefc9d9afd44c0a37aaa5c241f36801c8f30ad2036. 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/FRZ091800105.
Dominator Domine - Ecce ministerium - Domino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf7507a9c35b17f06721ef98108e5f61357909f3bf146cd5dea6d52ddb01401. 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/FRZ091800109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18fc41d8eb1a8e825be96c023d522262012c6837f31350368a635284c7cb565b. 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/FRZ091800114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9298b3343c7c2efb37a52f79860b0303e4f449a11e9a15b8918721abe278091. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRZ091800099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96159ceceabc158e2068b525f7c97ded8690c68addbd7b5ba1231afcf7c0c4e. 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/FRZ091800100.
Salve virgo - Douche dame - Cumque evigilasset
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef58a84117bbbe654b5d044519a72e18bb24e09f252f5cfc19f125bb6820996a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FRZ091800102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c7c54de2a90fd8a989f545e6380652417cc5fcbc6346a6b3d5bb5ed580ed29. 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/FRZ091800103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c81be05230b06c6b412dd63958cd693b106f39e5f20a98a04d9f1f7f970a46. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/FRZ091800106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283b75acad71059226305de5fa41d739ef759468939e23a20b2246744926aefd. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/FRZ091800107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d7f330ea4387357fffaf022891d052b696b87a2c762627696c7a634fb09c17. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FRZ091800108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d99a2c9d643389bca4530b88cdb7e3863d912ff4cf2f386617423c150302a1. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FRZ091800110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f5280db3eeb19d673060ee84c03f7a6ac3f169ec849ce1debc88277a5d24ef. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRZ091800111.
Chorus innocencium - In Bethleem Herodes - In Bethleem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3957274adb6a6155f6b50a33846fb2e6de55694c2f8f5a588ee92feb61979be. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FRZ091800112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233f57a501d4830349d75acd74063ed980d50937af3c1dcd82e65a708554aba0. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FRZ091800115.