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 0x17fa30d1f545c584b97190a539b3900dd8b3177d6aefe3c70fa5d68298a49ca9. 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/fd4eaa55-eb2d-4508-ab8a-4bac34b746ac.json and https://artists.proofprofile.net/proofs/artist/fd4eaa55-eb2d-4508-ab8a-4bac34b746ac.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 0x02302d12b1857dce32de14aa9512efb89647b03784ec23bdae59bd39c89181d0. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCADU1881437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11685976477dcd4408fae9b696a1c52fb749880049bfba7979ca7e3822b0b13. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCADU1881442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8967afd95f2af18398bd64139e1607229f8290b7ee84006188c0cfe0e4a4c10e. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/TCADU1881454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d8cc2274e086e4aef71d8cf8a07bee32ddc3c6478d22353bb413d0a2f55cc9. 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/TCADU1881457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb71838369674a2c6e02d0f5afbeeac3a514b99801f7304cccb67a73013facb. 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/TCADU1881459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb6908d913946d4d3f9aeceb69e66f68e77b365f0e948a7cebb263e6b2f9518. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCADU1881471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba37ab940231befe6063e609887b501206c82155a4f25d28000fc7d19631b7f. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAEK1960287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e51eb4a8efb04c54a76a2fc8675514bd829d9338a427fdfe7763f36cff0a7fb. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAEU2097252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0085f0e403ec835ed14a93c7b0367eb3cfdc524408544a453cb4e495d4d077. 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/TCAEU2097369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf01e38fd7c44a52d59ab477e13f2d74ac36c9acb50a1d6f9f4975ddb3a581f9. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAEU2097787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab815a8f2222291e6c97392d536878c92f0648625dc2b8d1bc870d10d38354da. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAEU2098098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8385d68d9a30d17f450a13f339511b6a9c790ec9b32c0f52b77e9956ea9a2498. 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/TCAFU2174167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f40a7133b68dd925e5d203f8b31097b54a06d8477b3de3aee1719ed9c9c771. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/TCAFU2174173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de81cbf4bda9c5db59bef7b130bf07d8254988db8ce11275470f856bcbc1511. 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/TCAFU2174179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ef7c424eca00887123b819537e93b605d19421ea3f6f8281180cd13363b272. 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/TCAFU2174196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23bf625fe672f24f0eeb1a9492f8d8e8ce9fa0d1bc22f5930d205e8fbc9b1806. 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/TCAFU2174219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1a3f68314ba8b13afeb3b7e521b823b2c3e6e19e57b9cd507e65caec7bd222. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/TCAGN2225879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b26c69d49a860adc4d9dc3503a99d653db3d23e491459eca2dfaf71ef80cf8. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/TCAGQ2222558.