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 0x4ec1ccccddb920ef9a82e233d8eb5bba2250d64bf25c198ed6c95e3e2a5b19fa. 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/25ee3267-4ade-4199-a2ba-77f9afa864eb.json and https://artists.proofprofile.net/proofs/artist/25ee3267-4ade-4199-a2ba-77f9afa864eb.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 0xdaa0bcd43bc31b709f9fa8c95f1cb0c2239f424411600ed6e4a522b2fa9b4c03. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLZ7B2000061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40909c37a351efe75ebad0c1a304f8e0b164b17204945e04f0d74ffaaf9ab19f. 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/NLB602300258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946a6159ca539b163bd6a37b09871993e3d85566190b4cd14247dc409514b382. 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/NLB602300255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b81257a946ea83587cf3ebaea2431c3c1c95b3b7f62d52f54e234fd987d3a05. 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/NLB602300256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee17c74a58cfc97f44bcfa7962e09b8869dbbdbfb1bf98098fdbba53fd6af74. 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/NLB602300257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40909c37a351efe75ebad0c1a304f8e0b164b17204945e04f0d74ffaaf9ab19f. 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/NLB602300258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e69a78d0cd1c63c482861e6de47a166c8705b6655fc0e08502fb9cd907fb5a. 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/NLB602300259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f6ff30854e1a1073142d202845df5cf7e576f47f4800cf7b787dbf388b67f1. 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/NLB602300260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890031dc6427f5a011aa923812fc9d35e56a8a8e479a2724b4a1e5171015a3af. 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/NLB602300261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c271e468f725e2b0d6a60086570c10232ae7dcf6f8a5d8c061794b9850df09. 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/NLB602300262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc87e030dd4d17c4747a2fbb0da88ce3d2429c1e1c32b9f0a9bafc58558ecaf7. 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/NLB602300263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c9895aa6ceb79b63f0b38d2021cdcb357ada54d3af341090d9c218cd8eec5b. 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/NLB602100276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92603c12fc7bf5a985d3f164f3c93b76f6f7ee60dc20ec90a5874bd9a643c8a. 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/NLB602100277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4cc59b57329f101db0c1e94308f163c239c79ab92c614259a68b4b27e72039. 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/NLB602100279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ab2912f66b9a15fc4736136adb8963abf2f0f7685b048c24f8ee670a62bd33. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLB602100281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1cf5951437f859be98ab70e0516cff0c8bfeb4957d342ece4c27eabe6ec707. 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/NLB602100284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f6ff30854e1a1073142d202845df5cf7e576f47f4800cf7b787dbf388b67f1. 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/NLB602300260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe953d42e0d9f48f5ed0bdfe962aeb2bbec4607f9e8bcab1331abdffcd8c5467a. 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/NLB602200246.