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 0xe5ea11ef9f4a2d180d338b3d7edb6ae10f657e8557dc1a116e06100e674930f2. 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/22b2e74b-8522-4e40-8b56-3c3b2fcc4460.json and https://artists.proofprofile.net/proofs/artist/22b2e74b-8522-4e40-8b56-3c3b2fcc4460.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 0xe4f1ba12fba3b5669af00dc85e4fb86d0ed2603d37cbc61670c1ea992674b457. 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/CZUM71900248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955e8983b39486ca973dad0df0bd4a998b8406139c083d17704c9cbd60f8e867. 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/CZUM71900452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65660a6afd768b4f1dd7c6eec34bb88b5c7f2659387d0b8a8074740182d76dc. 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/CZUM71900453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938f82447f52191a13d6b82f12dbdd47d2911f0ed4fa52cc5264d99971d3e99c. 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/CZUM71900454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe88b4015d005150eafc531e38b6a183da787e633b396d956c0e51b75f8fe63f. 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/CZUM71900174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28005e5c006bd29323bd85230913ee80cd8cda2714a729a69da1abb7148432d. 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/CZUM71900455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aeaabb25db259926aa8348d3a5945e3dddf86b14cac6dfe261663d86eeadc00. 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/CZUM71900456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b72263a9689eebcf56f39cfd77530b5038442d89290e1180c15948de4be0b7b. 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/CZUM71900150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b0f7e9650ec89102ddc308df7df3af7e0d7f54f19d0a92b31e49165c552e8c. 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/CZUM71900457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dacd017421542346d3d849b4fe4b90a075fdfd170e0e1e970d44e9a6741cbf. 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/CZUM71900458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc11685dd0ed0c1175136cd07680e13695d7babec956ff0f88acfc75043d4e60. 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/USANG1908868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb788512ea4a9b86974b13616a33158314b80e954eab6141708998050b464647. 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/SKA012300443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef1fe36dd6ecaea4cefb0433239b86d2d08b49e9ab9755ab6663febb44d75fb. 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/CZAC91800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437b0ffaf79b812d17eeafa62daaefed4a7dc0968c851f318064cba435719741. 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/QZN882149050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c40cf7665d356057956ed35d55a6524430ed24826537512ec913ce6e7adcfc. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZN882073672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c7ccad1bc9619cbb0b0aaa4ffadba355b4f717d43e76e9b0d46e483b39cd11. 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/CZUM71900039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc41211072fef3038794b60b8afbeab379dba16a05da62fe004b2a2541f2ca17. 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/QZK6J2300185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0523483e96579196325db6b92da8cf5fecef670c9d3739812bb728d1ee24bb8c. 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/CZUM72300240.