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 0xf9fe731c45aefc4ee5ac7cf6400ae830b787d7098e37f7bf554081b29262ca2e. 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/07a9ccac-5600-478b-97d5-17395c4d6d4a.json and https://artists.proofprofile.net/proofs/artist/07a9ccac-5600-478b-97d5-17395c4d6d4a.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 0xac76eec7e3385ebf6f6ade4066777f5703435e0dd785c7f76ffbde3d9d66a3c8. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/GB2LD2210182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7ff5907a06b0b7f6a26a922f03f0956473f73c85e426bb9394ad016b594be7. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/USA2P2231130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39e65ad4eca927a24bd128411c5d84039553f753aa61f57b617ee884a984ae3. 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/GB2LD2210246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360a8cc1fffd56d55b7e1c567571c1f0fa742327526ee5c927a39ebdb956a260. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GB2LD2210247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08e7941a0f85feaa61ff895128c7fead71c8e38e683300073c8b27eee0055a4. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/TCAGY2314237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd703ff5dc9e242da1432c6be839d27b854bfef924741275765f09d352981a6. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USA2P2338837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51eb5868e4a7fabc4e0f61c63e7aadde1dc194117a3880ee6de43a0273a1be3a. 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/QZSYP2472924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc698cc63b64278fe4544055fc4d265153e777e80c773cc203aaee86e4543cc. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZTGW2402995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa66a737cb46eae59cfa526195aa23fa98f564cd29a3c43dd583e6b0f353d35. 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/QZTGW2404081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd73aa284ce38fe4f38f040ba4294dffd587e9227b81efed393a3743f08d5fdb. 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/QZTGW2404398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e4384713eb5c69fe7fd0a5dd08ac7cb26170a8cf471aa95a4f96e994b7cb4c. 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/QZMHN2013817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1275ee5c19451aeabd63b0fae8b91485167b509b45d1cbb9271a15e81ffbe174. 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/CAR072322072.