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 0x540d2d68e100261ee740c6f5a149263edf5759f1868aa64ae83a42dded172c48. 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/74c945e9-6358-4736-9ea2-54a3a253d2ca.json and https://artists.proofprofile.net/proofs/artist/74c945e9-6358-4736-9ea2-54a3a253d2ca.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 0x8485474544a1e6c0eaa2931b76fb8d7ecf25ee8e9fcac515eb9581ace468f5dd. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZZ8B2397875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f34035a90c8b1bc6f21caf220484b86e4d6832a522611f815bcc8138a8e4a76. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTRX2437832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b142832f4e512483890a7eb116d40cce00c320735d5aa55669df2d3ca06799. 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/QZWDD2490093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40265930172e0c196d62ba69a19476baad1c075232641e37893fa1d85eb1bf9c. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZWV32439727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4509ebab420b5acce602edf5f5cd28bd68c33a0aa6cda1971c6e9ab6c246f0bc. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZWV32457007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe04354605e0792bbe73818d6489b8c37cb6e33c3a5861aaed331c8b2044e474. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZWV32457026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce0bed8ffa136347efa91d201f51550007d7b2bbe1fdeabf58b04323f69cdb4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWV32457062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8450a8bd686ef94364874ea66aae5e7461c7a36ccffd96128cf26a6fb141917f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/BK9V52500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ebb7a66ee8ea8931f1ab8ac2aae63f950b3c0bafd38ce51f0e4f98fdb9bf93. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTV32595421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7862a7e4298ec4ab2451a83598d192aba4fa763d3206a05cb9090100630d5d5a. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZWDD2564297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f58b7ec9711621fd707398b140fc66ce8886dc1cd262506baef1b61ca42c0f. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/BK9V52500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d70229eebcef389453a1124fe66c61904671243a513ea4fcdf50c213bbcf34. 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/BK9V52500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe5a9ef24bd08143e458f35470931fbba4e61adb67657ffb253b695b04bcbee. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BK9V52500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811daadd8a954290f72e01c7ff3227d9e0b720cfdf21aee768ef92e699011b50. 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/QZWDD2598772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe834e62c6a3ad53636f063e66e6b20a798a2a559210df491d3fe0ed0a5f1e72e. 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/QZWDD2598815.