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 0xdb98919eb8a9753095874c23ec62ad8e543746890fb9e1e1b80226aaa16864e7. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4552f380-c889-4060-a00e-6bab0cebec34.json and https://artists.proofprofile.net/proofs/artist/4552f380-c889-4060-a00e-6bab0cebec34.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 0xe87a7af1b3169f686a9e8a7ea4d4fe8c2e95fb214707458efaeaa5e2f50b4241. 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/CNZ682000230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf9f3b0c93bdfb78eb29c0fafe6568b31738931b7dff87aae5b96507bbb84bf. 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/TWU711804089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53afd02e05f034eeecc12544f0888774781d2bb8339b2b812a9ca9400a5963bf. 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/TWU711804090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe291a93188ef2d5419fcad905a20bfff4f0e84b0c7c0ed591ea1bd527f35259e. 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/TWU711804091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ebbf8162dfd6c2b3b8fb260b20a58793caa03f7e318be09ca400be436cbf90. 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/TWU711804092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f7d0b641b762dc4ad50caff3b91b944223ebbdd813e3224cf9ee0afcf7474e. 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/TWU711804093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6633745714cfe50c67a2615ce63329d1bff38388440c9fb841228c5ba6bf4450. 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/TWU711804094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9135c50acd60f2261c9bde5a651c2ff772adaf372b85499d28aae122851306. 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/TWU711804095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1297517cd537dcaf37b62d619920b08ad104075b6622524ad455b963f4c9a71a. 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/TWU711804096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bc6885194f587cc00278c24271e05120678256e17b27696e3347fb20ac46f7. 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/TWU711804097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18dd64d5eecd64a8598646f442a9104c431f621a4cc604511d48bac72ad36493. 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/TWU711804098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd2a8cfbb396d68940d0632154795830722db11b773aea48fa3c54a8b570ab5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKG732522360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da55a14dd4288a6f2558c8404b147a622461f8751b987d60f618bf935e90f36. 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/HKG732522361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b33a9aa13d72cf19c3c5b47fde0006deba6f1fe55877bc08ce7978b803dc7c. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TWU712101949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd996c83c0f39672b009c1c7bdba6a33714b386bcd6416916b927872f4b0b04c6. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/TWU711905454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c58ff5a044f76bd195fc10a1fffc34bd41397f6a3c1ca87fe1862afbb09d4b. 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/TWU711903052.