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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 0x641da92f4339aed774dcecf04f8c15d210487425e1d4666e91c3966a61ef77be. 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/9600a6ef-2229-4b67-a72d-90cb66d75ed2.json and https://artists.proofprofile.net/proofs/artist/9600a6ef-2229-4b67-a72d-90cb66d75ed2.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 0xb147267da7a10c6ec94f6459f311d9c620b651388f22edb3fd52ee64db98972a. 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/USAT21703115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671af21a3aebffe9170449c17fdc9244d32618390de85fdf14c587c1e3aa906e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SE5AJ2001112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a3d909aa53a4f24514cec96b32117de79945f782aec71a486f583bf82e4b27. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/GBKPL1969141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81800485f1699a2cd79cfa2518ca71156ccbfdc5379a8b4f0884cd0f790d9e8e. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QM6N22264348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da48abfb41d0391d45baf2594a6b002adb29d5a0896dd85ded3baf506f68da0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBHLW1703458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bcf53c13164bbe407b606a0529ad862cb9c8b4844dd3d84e25f81b9b6e752f. 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/TLREW2226059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828482ba65c1ab485a3f45a66ea97f6bdf62dc7015698f7dc65036b72cb3556b. 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/TLREW2226060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37fb1b4d3a7e8833d1bd776655033515d5b0c89f631e9abfada9511926c2e36e. 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/TLREW2226061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29f5f16a12b1daa809edd784ffbf10a332162e6fae43774e96bbf7a62954d9f. 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/TLREW2226063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57c504ee0d78932da696ba18482220829c7531d9d1db618481e8418cd7dee2d. 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/TLREW2226064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259d1a1f8058e84e6c2b26b3c5f507d9143114cc810af46d1b29d293491e4fff. 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/TLREW2226065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c6e731ddf5e68a25d74f846eb42f813edafb0c55d30190ede04ccce6bc36f5. 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/TLREW2226066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd8d6d0cb361384467f080d465ca5175bcfc49067c147da4be056886bf4e5ea. 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/TLREW2226067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99579cd08c77312856879b917a6b49a8750d18b50307670eda5fb600d66c512a. 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/TLREW2226068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c243ac935d6acb06c118cab3dab06a1acbe8ac054cf7f8b924f19e059bb04b2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZFYX2437616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0047937003fa5a0975a2b73fc549cf97062034b69f618d10279398d29e22880a. 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/TCJPR2282651.