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 0x2cefaeba548c49bd4b2a626ce338fac1a9338ea7a6f838b4be40401a7a4a4ac4. 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/64276628-13fe-47ab-a442-a7def5834d99.json and https://artists.proofprofile.net/proofs/artist/64276628-13fe-47ab-a442-a7def5834d99.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 0xd69f780e45181becb4ddb70df2d18d347477fa8d883b51c3d64356a8401b1a7d. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAEU2063148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4dd7a99f8c7bbe5ddda0c86f16b222fc038637fa3feebb87088f47dbc2fa3e. 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/QMBZ92026272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912953ec40b9f083692764ce8e0f454c0fb298d867f77cd9a918e3d1477a2606. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM6N22116737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca8ba31a6366a445ebb37f674480132ced08648acc71183afd366b92fda254a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM6N22116752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c729b40cca343e48e02a8f795aec2082a04c2f4e3af430086cb6188495c5941. 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/QMDA62150492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178090e7a83070a00a6dd6d78976306bdef5a9afae9b8402a8e9fd5e14da4bde. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QMBZ92287238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa943a0f4d850cafec5d4da2c85281d3875850de278ef5302a9c991f41a62eff. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM4TX2386379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a733480359142fb2506f87c643755f8906242d68a9bdbb9aa99d2a8889c743. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMFME2399891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2f535585b065bde3c388a517b60cfe44405a1d13db276acc06bc4a9e6fa248. 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/QZW9M2263079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2cd921c55d14290ac9a2f2f662787ed378cae10f9fcff99dbf549a4e238b64. 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/QM4TW2212956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a58fe14de7b7eacc42522cf81d3b2434af34c9396499fabbdfbdb2d4fa53c7c. 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/QZGLM2417959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e8e792c82f069f37662b419467a992cc9016e021d05cfe438e5d680cccf07f. 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/US7VG2490569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf436e08f7d6cbb658632bee4d6233bb506fa1e82712a0b5b074eb52e1164c2ae. 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/CLUM72100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe926c8c35c2bf7ea07ccf5efa06809ea1ee44d0c7209b137c1ff4ae95d117a90. 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/ESA011686665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332b8fa86d3a84e3c064ca44b18b765b6d312ea611a99d9048e4775fa6c059d4. 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/CLAA22200125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba3fbc27128f52b59fbdc927b2e001914b988fcfcf406be3cb2e687e8ae5a10. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZ5AB2328420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cd4e43471f5badfe93a552ebcd134af6f3762dcfe8f29cd79872f675873a80. 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/CLCY42100901.