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 0x6fde9ed6b046ffa0c3db2ca2b944dd7e7ce3930860fba7d881610f8952d4f3a3. 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/2ad83af1-9c37-432f-87b5-f3cccc93bc5d.json and https://artists.proofprofile.net/proofs/artist/2ad83af1-9c37-432f-87b5-f3cccc93bc5d.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 0x46a76faee6343fe7c7c61b63b16aa543417d2ec1f3d39e7c2e086ec43d806fc5. 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/QZNW72379754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917475e3ad71fc54210635fdd45b47b65927207d4c6ef74cb7ea1b55ef2a2eb2. Chain 2 (Bitcoin): anchored in block 960306 (2026-07-30T20:23:53Z), 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/QZNW72379755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926db584abc7be451d8b22050fba2257dfa0ab8f99e430b6c801d9861a5fc954. 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/NLT2H2400679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f39db6cb09de47150b9837ac1b51748bd8693fd87072410679f2341fc5ebf3. 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/GX3HH2437232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee60ab418b2af086f02a348f12b6418dc97aa82f0f46554e7ad209839d022e93. 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/NLQ8D2200866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01faad3b23a6373ba8d2130f3b54e0618a087301e717005636a7a3fb4b1143b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLT2H2301120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910ff2c9f0f9feeb1cc4a9f6e6c44609e6f1ed86b18fce72441a474c3cac66cf. 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/NLT2H2200956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1d2bf8908afe9f8507cdf2bc61f83e8005962e838f9f47d83c9ba9f7bfe6e9. 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/NLT2H2200321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aafb416f6597db857f464347216b8b7e14650642a99b018c61f093cf1b6246c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEA622303089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7bf9ee713c80fcbc7514e1ba44daf86999d1d7bd85eb2260ad74b64d89724db. 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/BE8LH2300419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7ed740485cbe416a8ab73988c8a5cef4ffa98c778f248dddef748948db1a12. 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/NLT2H2401623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f921501e6844661913e30d0470ad29b2e62df42571b0191fb38255c49d031c2. 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/QMBZ92472533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4888d5807bbd98368362274bc3b668a3b645fada7f877a9d7cecbdf3b89987d2. 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/GBKQU2460530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb898bfafe5b6c9dc8e24c95c18cd17c37c80e53aee7219554fd73d5c621d96. 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/BE8LH2400106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ec7630d11e059062554502403ccfe88e916194c3fff5db712447c140585532. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GX8KD2421036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fdb498fdea95715c87c371939a1c9e7272086e9f7147f31fd00cb93f9e53dc. 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/QZZ972373807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59e7554d3741a2a7ee250b44ad5fe4b566ab30eb98abf78abc8b241d5dc9466. 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/DEXW62400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5935ac8816f20abbf97ac34ae2dac606768829630b8622197d574eb900cdfa31. 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/GBKQU2355574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7c7d41323de1d5bb1c5f71443055b53be001eda7b103b083464a108950a3e6. 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/DEVU52312236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cca1299a9a6c6b1407bd1f76fbe652fd0776fb07048edd7da03765adf66095f. 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/DEXW62300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd85ea81ac5940e16e8218150fc9a88722ef8f310aab52180b501d65a5761c40. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLT2H2300131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531f1b7b91dfde3a9dd87298801f8ae196e1a5d6d2d453a0b25b7bdb63ab7579. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZNFJ2205925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4139e3675ed1908660db1be4aa82d908d853bb2f39fc577e8cc183b62f37629b. 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/NLT2H2200648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6141d1e7042f93b629054e84622fa78fc34de8e76dd6c5f0ecdd394037f668c8. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SE6HN2244512.