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 0xec89d1587abf31764f4d627c993261aa1636dac160a435dc72c75dd69b01bcdd. 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/47dc2e0d-9181-483f-9657-cf010d87d303.json and https://artists.proofprofile.net/proofs/artist/47dc2e0d-9181-483f-9657-cf010d87d303.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 0x5088e3a41e6492bc7b84e2e69b9dc9b5f09d1a4c554e0e0735b51c6621abb82b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBSMU9628442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aed0c7f5f642501f56d83973a6d89ae091f0b4c6a7b41f0f366e30bc7db2916. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/PLC062120236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7909f108692656664c224f1b1b0300aea9a48091184f9b69644fcc634975f590. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZS632186513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6cb2768594103297f4a1b95587214e846b026f119e5449365870d86c6bdc512. 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/PLC062237503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6d53b4f4bdac5fb73ba8335426ad3ba4a218b26a01afcb28bfd10c4840f1df. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/PLC062248537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47996add22a7ab963d8b0b972c315454a964959ef5123c5cf637bdaf5232eda4. 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/PL2DY2400340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd29754ff4657bdce99b49a29efc3d6e39cd3c461af8799a8247a02a5b29ba4. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/PLC062414624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d09d6939d130dbf45178c9f4b87d36e754acbe6a509133a03b2547e86741c1b. 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/QZTB32449393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2633561dd9b6bbd1fa50b0ee4cad80d48445e54db1c3d1c8a504ecb359a54f. 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/PLC062431317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048ed723bb937a8e42114a90fea6a8d7e32d347f1e25ad03e98e6cd673de204e. 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/PL2DY2400815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6ceca9fcd36ca5817f04bd4ac8e151c002a4e168c09028c19d1cfc95d873e1. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZZ7U2483925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4dd12969ae1078ab859a35d3884f4fb89f4fe6de896b5a63a047f82fbadcd7c. 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/PLI362333125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013f49feb4860a07dd82c8254d6e89a2142cef699ffd2744dd54b96b8f58a434. 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/PL2B92400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013f49feb4860a07dd82c8254d6e89a2142cef699ffd2744dd54b96b8f58a434. 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/PL2B92400018.