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 0x0076e5b6b5b88a82ec134878f3b42de65c64ca27469b9a2a11be351c7de39f96. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b65a7b9-aab7-4901-b256-f52704e240a2.json and https://artists.proofprofile.net/proofs/artist/5b65a7b9-aab7-4901-b256-f52704e240a2.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 0x21aaab04ae15c1c9d361bfa222f659ee488b8b79295e128b856e5c08fc831cd3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOZ7F1902001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d703dfc178cc2a346897bc57b6107275efab3bfe8664511592512e999fde20b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOZ7F1902002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a5e3d8038bab060921b6e52bbb0f27732b3886f2ca19464ebfcf7f17f7aa57. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOZ7F1902003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a34c8e25f32d380a47583a1f5577323ff1b828f585c09cef30a3eae19b91af. 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/NOZ7F1902004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa31bf94c5feae49fa275a1912509760a8848148d8395e4e9a0df27c6b594917. 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/NOZ7F1902005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45164675ab4b4d9d3defc2f8765fcaa413654589ae7a216921382c90a097cc8a. 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/NOZ7F1902006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8095a40897fcb949bb83dd4cf83807751f2cde97d99e0f1b9c892b11465de6f6. 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/NOZ7F1902007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ccb323e4d39b1d6c132fd6626bbe07756c56cc3d6a66ad101fb749fd6f2c0f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOZ7F1902008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88764d5a716d5c64ef1229b275ef2c6dea5848142402382c909c551ad5bed26f. 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/NOZ7F1902009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0941924a9500ee14c86a6ad6baa9de1b25de27feff438cc3561c44b9ef848b3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOZ7F1902010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b7e34a6616e8f990d1c6332ab48ee33af078fabe823813b1e48bf56eed5f35. 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/NOZ7F1902011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefb08ac40dd412994b18d6ba2bccccf5388107c6a306311e86809a09aef62db. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NOZ7F1902012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d9813b1a5f3ba5b808484ca96fa8b91745c92143ae37ecd0186bd2dfb65faf. 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/NOZ7F1902018.