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 0x04567b4dcacff4ec59da3e7233e7d2a5ba9bde7d6643b614b62df86f8e1a08c6. 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/22f49f80-4a34-4f97-ac17-32e1a417d53a.json and https://artists.proofprofile.net/proofs/artist/22f49f80-4a34-4f97-ac17-32e1a417d53a.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 0xdfe2bb42a67017b1e83f848e1b34705b57baf3ff0de15d35479981ec79c67975. 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/QZMHM2456269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45eb54a0863034f2b231d039d8c23d8d464b14d35c482ba719c84e8e9fd1ab31. 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/QZTAS2404116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135e16ff6809c477fd8a61884a3f57c9df2eaef16d2631ac950e426d822180a4. 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/QZNWY2486381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e28c2677284875a8fd7990662c140613af749566040c77932006e68dbeb3bf9. 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/DEPI82413116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1504898f2a5df32145076ffc801bd450021e5365602019399f95102e9cc20fe. 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/QZMHM2448868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4838a6140cbb615b3d144ec82fbaf4f6010a643f92c22b4315b1fda7f72fc97e. 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/DEPI82322775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24cda184cebf5e34a55d4687682e02e80f7a6a33cfdfde3e9c35255ea51dc06. 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/QZTB92319441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4afb9d4b7848c4e0fda96d499382ac99768fc025b46e2a94e1f3f3419bc2da7. 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/DEPI82322938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2ba78640b6f34c8070f9633b88c8d4baace93e5cfcb67bd8b1d0c21047a5c3. 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/QZMHP2330284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf00433f65874d53572a75a1a190bcbba9c59eb0823e5ffc939cbac4ed04b11b. 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/DEPI82439762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dadd9e8509bb08511bba96f766579178da8151ca3757d8935f8f8b4ff9d3f2e. 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/DEPI82439763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f119f2c8c02818c6ecca2a630366517c522336b9c839fe348df624d582aac95. 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/DEPI82439764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f4806b8198e6efbcf3ed2b86e0e1fb6d88ef603ebeaf98532ff8ebaafecd11. 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/DEPI82418761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02894918949f2c3ede3a32dacd8ebabc0a6c73e51392bac843dfeb65abe3a841. 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/DEPI82439769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23899de4e73c1ea7d8429eb32711075a3d5399a0aca3cd24266fa701d641c238. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:44:03Z), 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/DEPI82439770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bc75e4c20ecb73b76c17c97c4e7c77309188fe0b6a22f002bdb0849a8e8327. 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/DEPI82436253.