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 0x0b5f9e5948e3786940260efb5080803cef8c034c0eb34eef077a4fd750bbbfb7. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb7092bf-ca05-460a-865a-26f03445fe17.json and https://artists.proofprofile.net/proofs/artist/eb7092bf-ca05-460a-865a-26f03445fe17.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 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 0x0a1084e1f3436611700ecf93791f58f93119e58197e05eae8320c81eed61b9a1. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/CH7812219359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7616e8a9189823c583d947ca46a6a60007d9828610667c86fdab51e02b999f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CH7812219360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd63f1bb98d066f3c00328e4430654dd4fee42c7f54f942abd56ddb88899b7b. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/CH7812219363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99df35a028e0d884ff7e34589e0c7387d52d131cb9c0a8be60246faafd1272f9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CH7812219364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8b62b875c557b653b6f8b3afc3adee46fb1ab36e0bf3a1b2df3e89e5039320. 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/CH7812219366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8a86a8c08c7d9e19a372574deaaf15474c7d5efd073294fdacebaa2e5a2c88. 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/CH7812228256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172e1aa9d4bfe5a0583b2059e5262d5399b99daf85914a4d42f63f45afcf8e36. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/CH7812228257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b867b07ec899b41a56671293faf6eebe52be9c87ba713379dff8e5997d96247. 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/CH7812416027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f86cd24c0b1c337c8d5168270c302743c2845f5f5968d15616a9be29af16928. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CH7812416029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf924b7570f0b6dca8b71efcf540d1bf65af0b86c9a97b1c3a2710785f9392f5. 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/CH7812416030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95de9642986fd7b30eac4cd8a5a4781bfcbb62255ccdac820288b1fe05a6634b. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/CH7812416031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c8dda7f0cfe89773dd2642b8e6d9d2d1cc3badf367d8f783298383d28c5bf6. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CH7812416032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33544572fb537a5c0ce07be0a3c36ffb51034f7febad0d625dbae9e0cb114004. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/CH7812416033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9347452a9a29560e6e496dd402b41544dbce1ccba15e8bfb3b59620104a9649c. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/CH7812416034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abd3051c843f6325e52c111fd406e05cd819094434d041e40b91d8cbf568268. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CH7812416035.