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 0xdcdd39e4c274863a9875b6d41d9c37f6dd076668f0c660b1d5fc8ce7c3c2bd2a. 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/3add72de-c2a8-404f-b4a1-99843b7a4df4.json and https://artists.proofprofile.net/proofs/artist/3add72de-c2a8-404f-b4a1-99843b7a4df4.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 0x71efc647c8594918e35ba3be17f20f12da30c70e7d156b573ba8dc61195457fb. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZES62084080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd53493489ac9be6282cecd190ab9d76400e324d0fd8cd60d02377dc0695c47. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZES82089084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe402d56d7c3fd2418fc93685629042ae7868b1e0158bd206aeab5311f46d42b5. 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/QZHN52004756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dab0e3d1868a3245b8cf0c2bc71f894436f6018ac2f73017cf5a150ded4bb28. 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/QZHN72082948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4406ad5b3b2b723a82abee8f41a794786cf0d3f2ec9b1b2be393a3b55ad111d. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZK6Q2013153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad2935223b5a00f342dc036d2b774403b6aad57950fd9d1f74b1d998d00cb07. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZMEP2092314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627c36d979141a5721d559b467581eb715917bd3a139d0052f65eab200a522f5. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZNWZ2063990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbacd08c7b3f7015b9baf0a82fe738c6fe9dbca34f0ebac04bf416adfccc743b2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWZ2063992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfb66fc363771d85a82742153402ff18d4f08c9d7d84c45c07a2267f9947ecf. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZHN72232184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a0496943fcde000364e1c6bbca847f8997e44009f67ba24865f0b2d67e3c62. 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/QZHN72232190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d688c4ac81372972b89825628fbcde49025d4fc152bc02fae3ac648cad1e6c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHN72232191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bab5c4af3bfd9784c75cf17de064cfb229b9b94ffaaad9f66820e6b1a91c02e. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZHN72232192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7c7400e0dcd8a71a69e5df56482577a7f26f8e1dd7dc97e1f84ab9b3387ffb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFZ62483858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b3d79457b4e1190d72ecd5f07b8cac7e4461d868313c56e6b8c10aee2d0edd. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZNWQ2442035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393d10b296ef03db9ee293f82917c0041952d0ada20973c3fb6f5ee7e5d9ed9c. 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/QZTB82478045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe223e04872b7d476516ab45c07dd7edddf0a04049a1844748b6ffb48d7405f41. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZMEQ2567502.