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 0x293c4ae43166edcd98b1f4c1beb904a9a1dc4964d6f6dc13a5857d3f63c0958c. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ba06504-b0e9-452e-b954-c6cfbf7d6243.json and https://artists.proofprofile.net/proofs/artist/8ba06504-b0e9-452e-b954-c6cfbf7d6243.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 0x810ce4627dae3dda5c12a6cc3d92a04f069b0baba9e4d9f4555e98634710d187. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEY472173024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54da596be8aebb44bd05d22fb529a1c610895b4a7458328215df5adbff2098bf. 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/US83Z1917869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560bcc83da88280ca09987e1b8ec850cbed9ec4fc2b0658ed1f5512515022cd5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US83Z1917891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0255c542876d7d99e024e6fd769d5e48b4f59fc7afb50f8cdc31923868e3c6. 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/US83Z1917893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f117840c94e8267e471c4dcb7a3bb843073e932c41adc0d35d55bd66c8c0ce. 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/US83Z1917878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5222b77c17f25452c2e0acd6655f88b864737c3dc3dbacc29f6b556514fae7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US83Z1917870.
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 0x13ff5dc86c2b11e1103d9f66bf3aece3253eb167bd6a0d0f5d7b6aff9acfaf73. 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/DEY472179080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a680e5c7607bade6d2036512c380803fe3c4ffcb870663551c81fce3993c742. 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/US83Z2318654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13771f4c3617bd7126b178588d5f48d6422eb9a6d8df25b2269a6c2496a86486. 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/DEY472372614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5327ed9555f96dfb769f2ffdc11a3c4a96484a3087c54253c090ef986aa12a51. 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/DEU672100655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026f4beab66a4de4ebe6441c41f010cf515132f2506a30387a75e72e97e5cc19. 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/DEU672100656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271f03b5e698bcf66c0be3558aa9d204f8b32bf1f408fb1b747843da8ef9fc34. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US83Z2025028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f432fafe836724b62cde7913f87741e3d147d3a57a5cbcc2e3a4637c79f16d4. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEY472084464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf15d5c4f95b8919f7e5af957df9a96a6734b005929bfcbdf81cfdfdc092fc9. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEY472084463.
Bar 25 Music Presents: Sounds Of Sirin, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a3fdac1eeaf81c7d1246ca97ebb0cbb7f17da10f3107b84483005e5bec53ff. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEHM81800620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61315318d95bca44d29cf7459db5fb4e548395c496fcaf36f09a3f54d5fe5fd4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEHM81800627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53dc8b473c0e1c6264b33fe428f68b54e28bde1618fdd4bdc8d8382b81c3b435. 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/DEHM81800597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d905505ac7d1f334071e8b02b796f69770a4378ddda157784f613869ac1b8c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEHM81800617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a840cce30a3ddd446efb4bfa40c659049bb558921a0d95254eb396842a5704. 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/DEHM81800634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bb00f53b18710f5ad6b5c7898a3eb29c5930eb0091824edbf170d81aba3fe4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEHM81800632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba67109f7d23ceabd83a1c2502fc05436205751ab153d4923cebea490aeb8f0. 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/DEHM81800629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe862075631768c8fac27ac4100203554436d7112094c400182649e1cb66b809d. 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/DEHM81800615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8014513d65cdf363ad674a57617a935d1e08faf757f2dfcd9ac8749fa2bdcd29. 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/DEHM81800625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129f4eb5aecfe57582aa114bb63e75c6ff4cb615ad149db0e8ee9afe3955dbda. 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/DEHM81600161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29af4e8ae432df16c77bda539a41fa634ed57cc31f9eb1b385274c527e286468. 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/DEHM81800623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3947fe6ca128dd8822ad52fd6c5ee1a9339ae284d3959d0306d186847c60d01. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEHM81800618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a4577114a425435884d83765e0955bee33db6a4075e123f3cb10bc8d5dedb2. 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/DEHM81800631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91cff15f4b7ad95d875d2708119f050227e9bac066aa505482505e2852cc340. 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/DEHM81800630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca99791e0a72e2f3d8275c45b5b32d6996f5da9718157e53a2d7aa7d7d35c6b4. 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/DEH742101799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ab3b26c491aed998f0bdfe39d933e7ec4bedc151321b672e4c753c62dd398f. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEH742101800.
Planisphere of Dendera | Southern Hemisphere | VA
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a155bb6321e209b97fb7d0aad5418cbe11a0607c7c900c5c9a4055bd9aae2c1. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US83Z1908351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f891488a390867bffefb6273a30483b01cf719ab4215dbd2be919e71c8ba6e9. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/US83Z1908352.