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 0xa486cccba4d948cddb19f399643eef6dbc75d29662734ff8d2a724022255d2de. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ceb7672-f04f-44f7-8e41-6a8a1f54a965.json and https://artists.proofprofile.net/proofs/artist/1ceb7672-f04f-44f7-8e41-6a8a1f54a965.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 0x54dfc8c11c1a36333faebbc046143cdc3de4b3cd5a7fb31670c959061863534b. 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/USHM22283272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556b0eb61e61864cef9ef5908e8b738c7d89e214a8548c0d3e5a15ee29fd95c5. 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/USHM22283274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240013eed2a476cf3722833d5dfed8b8b40ce98ef601a281578abf579d583415. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USCGJ2397859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbdccb23f75ddac2a09d0b82351ecfedfc3cd855477782061deab978aedbecd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USCGJ2397860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652c865e1712d2c9ea050a061b35a840025cdb18c11fdd0ab9a0a3e64e0148d5. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/USMH92336320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7738c6c277f09550f1a859fa59bd4df0cce937364b08549c4c81276d740e22a4. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USL4R2390307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51aa495ec0eb8366fc8ef07450f7486ac43648cae9962eb78f7c1656963eb972. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USL4R2390308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ef17d2ed20bc19f5fa41e7559edf49cf50b38ad47a1c210e776558fb913a41. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USL4R2390309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1055fc210864d5471583db4bbfa097b5f698a070fb30920786e461b612ba63. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USL4R2390310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d9b929ff0682d55bd8ae1c3eed260f93daeaff143c4c1d62da3fb82bff4572. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USL4R2390311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740bbbd7f1f23041bab15499eb60c94462d2b9c675c576e1b9b24eccb5e63b69. 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/USL4R2390312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0281eccc1f4116dc05c5588f0b1914b0336efe5672f2f3c797f639d00521815c. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USL4R2390313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb384d7cc89856a3424225a01c4452a66d1fbee477e193f42a984cb6a4aceb949. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USL4R2390314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519fed7d8deb512129041b4e72af37d627d1656d683b59420a659c23771d2cd3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWDD2523485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0215c18bd1a615c0a9924f7bbef99c902c65e0ce4c14f1db185f98cf2c80018. 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/QZWDD2523550.