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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 0x39c8cee3bf7c4f30ded27fd845a3fed8e61c05d3aa66bb13f37eaf78c578d116. 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/044440d4-d71c-45a2-8252-2ea0e9b6adf7.json and https://artists.proofprofile.net/proofs/artist/044440d4-d71c-45a2-8252-2ea0e9b6adf7.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 0xb00621344ea05ff26c507041eed5157e9c54ea0d9da0fcf2a5817ded9cf282fc. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZJCP2000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b94654015cb09237506a4bb0a6fcdf29ac0c1705c60d88ab2e9eea1a8f4f72. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZJCP2000028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc560107fc8adb54e2a0061d25df250ab39717e61369292119d058359996b2b99. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZJCP2000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f47b07fa80c041eafb3a4eaa619db4937d1bf145dd7b58612ac99463444ec9. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/QZJCP2000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c27c7713fbda8f8261ebae92ab9bccdb1d5f59fcb2b85f470176e1e59995555. 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/QZJCP2000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac364d3abbb222bd42209056e9d8eab683f028e94fc8f1382d823bd138673e0c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZJCP2000033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db0fa151bc83be6c2d2214d932bdcc09119be0d1619f8de007d05427388269e. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZJCP2100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeded19f021234d06f71851090179a7c20abb9e432e7fe985ecf8e4edf383b961. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZJCP2100164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4887292590d688a39d8d24359a19185d45f60617ab9c9322c1f04b1735a944. Chain 2 (Bitcoin): anchored in block 958554 (2026-07-18T13:17:01Z), 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/QZJCP2100165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91a446d4d07cf846eccf6fcad53683ab9f0a1fc1ce5ecc7f9ebd3464b44d122. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZJCP2100166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752d3d27d9d8da4e0b67a3e87708df92f4ee2588b7c08d9945b8a9a33aec7280. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZJCP2100169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a71848a39b2a07464e4db4787fa0f78c334fb39fa9fd04e80f7ed5eaea5fa2. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZJCP2100170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb88789c64d52f0668c78592cc42d384b7f86879865a0fb82f052db01d0d8d41. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZJCP2100171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80f9ce64782a5a7e89a283ca59f5e4d8ea7a56f79ec524dc2d7d9e877a8a347. 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/QZJCP2100172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd3b25257def2c859a0922cf64e60d96cbb4f0345c09aebe50bd81b3910edb8. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/UKPD31800004.