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 0x3100a17085b3d6921ec4b4f45164ca3f2e7ca6d215edf385b063c5643bacfb27. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/73577f83-2ce0-46a4-b384-3460912e9370.json and https://artists.proofprofile.net/proofs/artist/73577f83-2ce0-46a4-b384-3460912e9370.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Christine De Pizan - Chansons et Ballades
Cathedrals: Vocal Music from the Time of the Great Cathedrals
Inspiration (Hildegard von Bingen: Lieder und Visionen)
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 0x8656e0fa63cacbfda4faab4456a67bfa5061668a1b9b7f1e853fbad010c90001. 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/DES380020828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff56cfeda03b4a6a2d1fb4a13c6f82e717c0366ebdee798de533007f520f9a6e. 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/DES380020829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98956324f3b1f00bc805f116d4fc56cecf93ab18c3609ae07fe8e02cf94db74. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DES380020830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa253cce656a161b197cda98395f8ae7cb63f19db28d6ae386342e31edb01703c. 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/DES380020831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382078d8911fc20d3badcf9d501e00db7b0b2919eb396a71317034c856fb9136. 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/DES380020832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f501c0725ff4fbbe551f72fbc185ec02d21dc217b39d616675e601669f4da37. 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/DES380020833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b36d33898fc0a773424d2c6a8b7197c5873440fc05aa53b25bbb760435c4d2b. 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/DES380020834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63df8d00cd7f1b39ea29caf23bd5184942e29d88dbb7b878784a2de2483d2d7. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DES380020835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedcb0e323c19aa5bb5a2b8f1b03fa699a275274f834edb857e7e22c409986fc4. 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/DES380020838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84481043d16fe976183a328b6a65d91d011a5910a7b1cb54c62367082117d8ba. 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/DES380020839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1dd9b4eb6903125b099c7178bdd557721f527af51b36c24cb7c22184421338. 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/DES380020840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716f87e549545d41fd279bf5b734c15ecf2fefb02fe330a5a4402994a9bb7b8c. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/DES380020827.
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 0x4e9ce0bb2b65e4df104bec448c1229579836b9783bcd870d4617660bacb1832f. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/DES380020836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d010e3b6a6ae98fe84f99240d91a016bbe03e2153204ae6a4666f570829084. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DES380020837.
XV. Studium Divinitatis II - binaural dummy head recording
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68aa1268e4abccb7afa087e35f6527c032849653cd93897ee2aaface8f1f75e6. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DES380020841.