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 0x3be0f3cf3c4570ce405deb68b7115ed8dad902e5168280c6c55efa15874ab5a9. 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/320bb780-2ebe-4ebb-a0e4-8014313007c7.json and https://artists.proofprofile.net/proofs/artist/320bb780-2ebe-4ebb-a0e4-8014313007c7.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 0x6c26c93a88ed6d1a10fe84b6a2f5f98117a3a29e70891c0c1f6c7c9f8a5be252. 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/TCAFG2072441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc154b8cdbbed6f94269bab11b151bac051b12e8f2134de212598a5b9e727309d. 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/TCAFG2072566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718e5a9b5b925201fa37875bd78a334380d756a4741164ebc99e265334525ef4. 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/TCAFG2072578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15ec516dd7a05d88592d621ba07946373ef386e8570ed4bace84f98b17be37e. 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/TCAFG2072588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138b62969e340cccc0ecb4c9406677faa0d41e5cdda8dba2c04fa85f9c184d91. 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/TCAFG2072598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fd6f90345c811132566151d37d9cd2c952eb9de14eb8413135a3d38ab9f821. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAFG2072601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6277f78d693f35269490116abf246a8bbb340cb83b38c01360382f23f0591c3d. 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/TCAEE1964942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171a03b25d8269d83e18434f7e1d7957424a5db9e6d6a361b1558bb4b08826c8. 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/TCAEE1964959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc939de5b5ae3eab0f747f5fad6c79c9216c1e043459220827892235b2e289ea7. 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/TCAEE1964978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4e87936b4b25bf04cc56cbc0e81f8aa770b7d6448bf660eac6c0d7ee40112a. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/TCAGL2295774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aee92ee8139d3e7aae7368c208e284ba3c48cc399fcfe4b9ff8aef0abaa20ad. 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/TCAEN1976417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b5946df34280268799852c2a136d785df577b2c215b6cc24ac56f7df68c6a7. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:52:31Z), 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/TCADR1857829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16dc68f212084f10a860460a5207f715900a97ff8b4e1bac493331742eb5cf14. 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/TCADH1795160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd86393549d627fcc90c6842f614a3fd61bee0a9b28fa3cf99486d86306cbd03. 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/TCACZ1768703.