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 0x93c8a00651fb1f62157664e53dc5c7d5545cc7982a44fa0e42ea9b183f068d95. 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/c7a015f7-ab5e-4aac-8b56-88ca87759d4f.json and https://artists.proofprofile.net/proofs/artist/c7a015f7-ab5e-4aac-8b56-88ca87759d4f.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 0x0dedffddae30aa7c54f01592498df42ce83221f47041beed221682c6c189235e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNJW2404089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4616ebafa094ecf33a5a7c0e1c157e69036b88917bfc0779ad40ccaa678bd037. 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/QZNJW2402886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe689679e872e2ef06b3eb475ff361be69d87ceadc650184103a4eec3bccd7135. 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/QZNJW2404087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0b09acb66834813d5bfdf9fe5d24c4fc69329689ef135e2e71099ed5bfa237. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:00:18Z), 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/QZNJW2402883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f3389b812d1b5c24ff04164aab77ada74a281bad796d24bc87fbb6a203eb4e. 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/QZNJW2404080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22bde9ab32a1082f39e0b6095e554c2982d294560bec4f20c3547395fd49ccbe. 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/QZMZ92450584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50dcc50d604b9931066f3aad3b062f210e15b3f035c1e044a7e64ebbb6b4539a. 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/BCM9A2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fdab1604ce3f40565ea75572d9897262b70b78b1ac92dead708dafa26d1e55. 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/QZTVM2317217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020b48cea90682af4c9de8fcbc3ee8119a317a30e74b6fe428ae810603aa1266. 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/QZNJZ2304334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070be50f7637e7a36583070cbb17bf96106613922dec052ee6c18c2288370c44. 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/BKCEP2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b55d5d11067f265742a388acd8790cb82641ef42b1ddfc46588ee139fb8b4c. 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/BKCEP2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4130799e014f812dc34df38a2c58bc3f4567e2b9e8da9297ccc9c56eefcedb36. 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/US7VG2319205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ab0a7c8e913decdcef01b79dccc0ddfeeca7c023be50744061805cb49231e6. 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/QZGLM2271167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ad85138fb6a06e1dc4a594419a3262a1ff5e757628551cd43f0667625d304f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/BKCEP2400022.