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 0x0802fc7a2f83a28bb0f6c32f1bacc1629f9ccc1a9624619d323d362925cc6fbf. 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/83fc6ac2-9fba-4e35-a672-fa64051cb47d.json and https://artists.proofprofile.net/proofs/artist/83fc6ac2-9fba-4e35-a672-fa64051cb47d.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 0xe0e7c9138260522918c91608b6110c7e2babff99333eb5fcc57ffbef7c5003b9. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/ES71G2203025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34c73d04357bbc56c60e6c9c20ef10ee027eeec5051985ce21db0dacc3bbe59. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2203026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f72470b1ff7f305b6109e5edee6e91b2e6cce56d06e9551bacdc6a68a448036. 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/ES71G2203027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd392d4cce3b911bc28089a7ef97785cc443f1109a863f417034806ba1ce68e19. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2203029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565904eda291439f356346e8b6007bee9f132eaa835165e4d19e0636af44cd82. 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/ES71G2203030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045df737b977d05c8457ab317dd37c2ac8e564825e8fb9276d8c8e8626291dcf. 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/ES71G2203031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614248025575670a9125f00cdf2eedc9821aa5502fe8672aa95587b1d49f8612. 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/ES71G2203032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea7ef7b47ebcc855200ef6f2725e19c3f9959762394384e5338de543fe1be9f. 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/ES71G2203033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff826cc59142ba7d1ab6fa2cdf44cfa0bb5649a25e270c4de8e6ce4e75f2e95. 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/ES71G2203034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ae0681d912f0237784ed1a7c2327b0b719aea7dee0d4996703ab95ad07011e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES71G2203035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe514df1637a75391309edabac5fa99d45031a813e54e05fb770c630eb780608e. 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/ES71G2203036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a614a3a557567c846155f260ffc8a50bebc4b571dfa6ff99560017280d0d762. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QM6N22261348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c8b7233bec3e19ea7e3dc81f41a925bbf1d2a0abd0558dd7a3a30019590c1e. 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/QM6N22261349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc725af93e172cfcda3fcdff2e8b32cd260a3daa59bc50419fc89760a5e39bbe1. 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/QM6N22261355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1648ce1ca5d00a282b7cb751c3df37ed9c25a5f5c6f8e9243d604bfe425bab0. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QM6N22261356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755c0762b0d7bc34959072e7190c351df5ea4b911241e3d57f8e650882310958. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ES71G2155434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa390d15b77998c37ca67cce8f37a3fd2f195ceebd21c4b05876cdf0def0dd318. 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/ES71G2155440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f426ecb0e492616f6c6744d18bec31bea76c0bea02714667bf4a20987809a2f. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ES71G2155441.