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 0xc9a50f78e7c860bf79cedf4d074679e61530739c996095af7117344dcb27e229. 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/97dce2f6-b7be-4797-a994-65457d201dcb.json and https://artists.proofprofile.net/proofs/artist/97dce2f6-b7be-4797-a994-65457d201dcb.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 0xc8141780fe4ac3bd75ca83f3ff7000be34ba2ee62e40923d0124162756accfb6. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZTPX2500420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47967012b5db25c23b329215449a0ba0743a0329ef7877c83a2dad004fd6d5d2. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/DGA052334402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956a5b08c20899c237f0ebaf5c199a13934acdf657bd715fc70510bad09a1424. 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/DGA052334403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30e58acebcfd4d36936c458038f6de54907bcd47748cadb530035cf7d77eabf. 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/FRX762361370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d2871922ff2051987a475249a82d5a53757833a5109db72293bddfa7944ed2. 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/DGA052334404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb856c1b1332dda7f82d6559d397d33a4d62fc3dc5ba6eaa7ab7b0f5e620aec30. 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/DGA052334405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cf8c74ae15a8fbf33915139732b8fa9bf9d02ab2349ccf3db4792cd3b84043. 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/DGA052334406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0185b7c5dd05f404f6db6436d57419f9f36a022dadd6258d56bb44c515f08ab. 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/DGA052334407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5ddf0b4f67fe30e17a83a181b2bfc4b3dd6b83a01e1045efe676bea9c6bcf4. 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/DGA062289838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e2dab7687efded0f26afeaeb2fb569703622a47202eddce389a6ed422976d7. 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/DGA052334408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc5dda5409f763296e97f19b2deb081c6b30031b6ebe3705d0658079daf0a87. 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/DGA052334409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb059bf8b56f699b15ce5bfb051e829062637061863e34f585474656b2c4d4077. 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/DGA052334410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46587ba3f8e0a5b2484cac929a1c1a7b4e90f98588eecea402ce19c75c3caeec. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DGA052334411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33e8604280de76d164e4603309fd5601c48d1af6ec5caa408e51469d3b5792e. 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/DGA052334412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b49eba0b2b75db3d6e8cf1f2dbfac7b987a4f0ed5e57b6f7f7799aef13ea9d. 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/DGA052334413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa240028c4ee9f8eea0133db5a36af4dd3141b86d7763f99571b80d868b70385e. 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/FRX762179781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4110bb87f6c43f1c7fbe57c8d0ffde143a9b08bd6d1c3866294a30c885755f59. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX282220297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ab7d89259f85915d86a8d7d983eecfddde01511f5aaf1ccb37dacccb739a5d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFI2156114.