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 0xe25b3335da5c6ed59e4cd7f5dc4438d2809d82b1f13371f90de7cfd597169353. 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/9fa15967-5abd-4ad2-ab28-9137cc1de1ec.json and https://artists.proofprofile.net/proofs/artist/9fa15967-5abd-4ad2-ab28-9137cc1de1ec.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 0x9f656e06fa79f505369a24471512a1fd2b9b2128a4554f6097fa719fa779a78c. 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/NOX9X3808803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00b3045d95d588df3704358b3b201c6eb37579e36fbafe50919099ff6842b1a. 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/NOX9X3808808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb23d7561dc15f521ca8c8a0fcaa2463e7dcdff89fd31ceb1c2a5d662028c9c. 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/NOX9X3808817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33763b5162c49146363b2c3cb8a4e7bb31c14e20163becdb29f4f68e9f74bae9. 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/NOX9X3808819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d2ad2ebe8679845e87b748ebea12713154bac7fa63cd48899b4850cb47e252. 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/NOX9X3906005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7489f1ce80018d75f708344d5c4ec1504abf76490c6c19a86b8bec32cf8874c7. 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/NOX9X3906007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dde71b0160b4a306c8bda90dce0133c4d1741378064ce9bb37139927713fe54. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NOX9X3906009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad4117ee9f3fa34178590a3205134369c0f2671eb82f86ba3dc6a16e9c2a01d. 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/NOX9X3906014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6665a7347ef343cfc05224e1eb62648d27ca0c8f65a370e26e4121e2e1716228. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:22:30Z), 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/NOX9X3906016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12eea0f4a0a184be8494e1817f2ffcd1f26ea977a886c8b1c7b0ad6d42c4546a. 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/SEMDA9300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ab589f23f05511d309c4e36795b6e91b6c371906c60ef7ee4c166c83fd322a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SEMDA9300105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52b9cab9af2a505c015d4d96a6b9c9a523b0a76aaf6f53f627d9ec75e003245. 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/SEMDA9300111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f1dfd4a496eb193bec6751c2c0a574cc429a6b479e8642f2966a838c7bbd9e. 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/SEMDA9300113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56208f7b507291a2d64ad1f6ca76e87c9005b116beb993df3de0b4197b4dd867. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SEMDA9300117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecf88840b820e3bc7fe116b687c72470cf924eb48325c0a814d167faa764869. 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/SEMDA9300118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2372faff7a08d3f0bf4a6b1520f68177d88c053570d1149867320e2b5344377. 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/SEMDA9300119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9794c0a1d5b1a8f861059d2d27f2af67411c7e672f9cd2afd26c57ec0b5981. 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/SEYOK1102305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1803c9d3f11feefc9dd42c1d355ec7d3070b6f11fddd3bee1f655e0f9a53ff50. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SEYOK1102317.