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 0x4bf5a80ab9af026dc4ce038192cf57cc3bc855c113a800a95f20eee20bf0b4f8. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/93dbbd1e-8994-4190-b952-7bd3459ef5fa.json and https://artists.proofprofile.net/proofs/artist/93dbbd1e-8994-4190-b952-7bd3459ef5fa.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 0x4d10a60cf479e89990c2221bf2bffd9865e7839a8042d520e13173f869eb2f77. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NOGHH2302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc7872194fcd02d86386da53d4574946cba3c484daf234ece9ac901cdc1fa48. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/NOGHH2302020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f9abb2bb19cde8c28f3b3c6848127239d373817c0ef3c518da9e31d33f9b6b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NOGHH2302030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d8b41d9cfd923fda3670e99581e3c790ab9a620e0487282ef17cb424299ddf. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NOGHH2302040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b8aa6c48952cb3cded892de9003d654cd1dd8354cf5d9fb0b984e45e40515a. 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/NOGHH2302050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4062c1e018d5745d3630580e817152d71c25ce33029b09f609cfeb9c3874b41f. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/NOGHH2302060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfacfbbd241ebdeef9fc66d22f5143e09e3fdfa3375ddf9b530bfe8bad434a031. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NOGHH2302070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253d55089d6209872e113bdc70f72dadfb459ada6a06810297a08d13805f9ff3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOGHH2302080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab473b1fc5be22d2f4fccddfd226915f6d46e47c1f0dcd8ef805a3dc03f2e4d. 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/NOGHH2302100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf269fc08aca8cc569799870c12d85eadad60cd3eff9845f2b7fce18b89af7ea4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NOFKF2208010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56ba5b894567c0c59c5903d7acd135459fc2ab91bd92fdfdcfdb2a2bae9e825. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NOFKF2208020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326561f5649faf9308d7c614993d650ab30eab538fe62269e8040fd601a1610d. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/NOFKF2208030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2818cef05c3db7c3ddebb42a02e3fd8eee07b4744c71ff840f172e433929b970. 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/NOFKF2208040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c2224e3034c81e5bbf9dc8569cb471c49cfd6de2bbea295436a0edc6d22c60. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFKF2208060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6da4fa0aa10a63518e6def0e85e1f013fc5fe54a6b6ff0313f4f168e18c45b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFKF2208080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6a501b9815433cdea6e54574404d910eb16e8ca4c57b2db56212218023758c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFKF2208090.