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 0x57de095aef95e3761bef8b8759c1a1904b95a0daa0a6e6905a72356e2cb6fd19. 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/47c8f34b-fdb9-4fde-abb5-6c54c51f7586.json and https://artists.proofprofile.net/proofs/artist/47c8f34b-fdb9-4fde-abb5-6c54c51f7586.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 0xb90f142c7c0005e57df1942aa1205e23727e5eace0d0274a481499c08a7f1784. 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/PLUM72100470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4177d7b2d211504db70b0c5a19e5475b50f7e48dc7b43e726c72922f70e7e1a0. 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/PLUM72100472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cac3132b1656aea7a7c830d56ec9e4d8fa08cb27b8a0b17c48b47ca3ec8ae40. 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/PLF242210845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733dedd056a1af617aec2582a67c43d475dfb7d51a2c02f91e615af160de6cb9. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/PL2DY2400801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747486308dc9ab61fd86afdb46239cd802b5dbf561356526d080bed0aecce185. 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/PLS431800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38e2ec8cb0f626449750e6e9973cb39a224e8c611230063c7960e4ddc701941. 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/PLS431800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a43b21bd66f6801c883cf6b1e3ab980f1c608490f42d9fda21243293c9059d8. 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/PLS431800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abf7c28a28688c342b48ac5ff013f6439e291d2ac7be0a0883c3eedc637c65f. 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/PLS431800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2a6067d3a631fa05f1a199bc4607c340ab88909b8f7e19a31074dada549f6c. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/PL90K2200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87f2f2d7a82f733a55119bbf092aabd4e5b3ad5478c617a7d9afa7ae1ac572a. 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/PL59G2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2de24a73eadf969fff4a949fc1976657e2d438bbcc76ebb781b4b83f92fc769. 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/PL59G2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03353fae578dcf9af9301916e0067038f2762d557e6420b0146c3bf053b26da. 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/PL59G2000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb28bd76be9653e831ef8bfb7ba5c7630c6cc26e0db3161fda5580687c3793d7. 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/PL59G2000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff84f8655571f10d871b8bd688e15847a454f292aa3a321705f25dfaa0189e2. 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/PL59G2000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac3ce2c5464c279675058f3ef69b94dba21d519ce5740b8644fb531765cffa5. 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/PLS431700043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7852b169876147b37cbb90351d62e7adc9127e7c67b6248516458ff08ee4e6fa. 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/PLS431700046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6f730b97861b04920a6b972563e39117be1d197af031f95ccf7edd4a25bc25. 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/PLS431700047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed55b6c4953243a0c0a3f475afa3d9dfee5bba6995cd7891f5df6ff0cb83b6d1. 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/PLS431700049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8444ecba186257372367249ef41a37b49a70e1f388236b7a762a79caf371dc00. 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/PLS431700050.