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 0x3ae2651ef96db0c619084dc948ec3f456dbaa3a97899f11f83a0ec34e28800e8. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/137f4bd6-625a-4410-b082-ede3bb804aef.json and https://artists.proofprofile.net/proofs/artist/137f4bd6-625a-4410-b082-ede3bb804aef.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 0x3a72a9f3b2b54bf5d234e9b553e85cdbba6ca1677ffef87abf5b32f96ee567f7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM4TW2388568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b49c4703025659031d3848d505deef705dba82ff25234ecbbdcbe40c36eaead. 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/QZNWX2282300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11dd392828beeda675a81feed64e7677b3d0bf51638f7199a0c5dba6e0c98dae. 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/QZTAX2248232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71d6d71a015991c92dec68fccffcecabbb354ff774d7f4b94f47ac457e7109b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTAX2248233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6969b5c1e026af8700c685379daa2e04b2854e76a1f7d410b9d573abafc37f2f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAX2248234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58a1efb629b2f53ddcfd6db3695db299e477ae3609a449eb784a839cdd4fe5e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAX2248235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343ee4a0cbedf90a75ca3b7dcace2d598d7ab5bcb9c5f30861e30d52e01b2364. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZTAX2248236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f0d370767c49c4502fdb64cc6e2ce924b85fbbe54776aa337c98f45af3808c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZRP52221070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a97d6ecbb41d7a3044a7eebd862f6e753bc26f5ff02d9cd26675b997ccac6f2. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QZTAX2248237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3fbcb58feb2b6b7a75bb37878a0d0ff58a405395c90ec828872e4bae51fa96. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZTAX2248238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0f8d9952590ad5d3ddb391806b07e2884bb11d31247525e4a64a2063293ea9. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QMFMF2326891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafedd870cde1c33fe025da49955e6a948cfe0a7ba907004c3261321c203df84b. 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/QMDA72555172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbdf7c89497e8ba0e94d8d49dc215e311494fedba656688c7763205bb078b5d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHNB2239205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e597ce12aa0b33fcbc52b191e221c43b9d18b084b2c6f34c0139300a0d5f774. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNWW2236791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbdf7c89497e8ba0e94d8d49dc215e311494fedba656688c7763205bb078b5d. 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/QZHNB2239205.