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 0xb425af0b2f769721af79bb2a1a3e7795cf60128d982f3f301228f162462349d2. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad1af102-6518-40e1-9a79-35f6b8bacf96.json and https://artists.proofprofile.net/proofs/artist/ad1af102-6518-40e1-9a79-35f6b8bacf96.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 0x18f375f7b1708619bed51cffaa00f6e3c9e0c2f1cce041125e01dffa2eb91d96. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USY242476605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46eec5670c20e1d651b3fbd45013f2b1aa1ecb450e4637dbc56653e986e24722. 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/USCGJ2553439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98e48242766f5f7e83f990fb470903610c05f138974086631e4afe27f8b7db9. 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/USCGJ2555164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af43ff08e870b1efae8520ce68fcde613de9044c27c13d2807ffe2bd2be7b73. 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/USCGJ2555165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0040a5dae3f4585dd09b59456c50128c889e7f8da09a25e1afb687c95c8b6e7. 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/USCGJ2555166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e87615a02b4fa19c7ce51826cbea86bd690768984090f9e2030ecfae29794a8. 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/USCGJ2555167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184a9d5995f18336b84a39f89101d634567d9e270f6a8a1ed7d351e1f6687f28. 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/USCGJ2555168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f94bcbea13c3ca015870e9b05bf47e77ac2fd20954d58e5ceffb14f1e12fd32. 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/USCGJ2555169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06b3a3bd872e45a04d2bce28df5c82967b879dc0b33c5e98f64fc5fa9c6ccb5. 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/USCGJ2555170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ca276e41d643e2bbbc28d20d6f93e854b89936fb0276fac6acce1191f5e276. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/USCGJ2555171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349b74f2e851e35f96a6ea91a6cef83ed13931ece2824ff2c874cf87484d2b05. 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/USCGJ2555172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a12a18039d4d06cfb0101ae45cfc9bba3e62508b06f0c09b72d6e9c034d2c5. 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/USCGJ2555173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538fc42f00d00fe585f500122e93490ec4e3d1f0ed248c8d28572f119ea27630. 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/USCGJ2555174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaeec9395ad0e45f9107097bdbe183a27e60538e3c0ac82fa942a7b8f1b69d39. 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/USKHG2500037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a9547e115a5d3f9c83c7179b8c28a14c6c8db247b07027b4b3685a928de1a7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USKHG2500038.