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 0xc0ba53e3de5bc2784e6427fbfc86765c34f90ddcfdd64cf8baa8907d29a1a97b. 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/5d2532fc-6d7a-418e-b7a4-83d66cd150b8.json and https://artists.proofprofile.net/proofs/artist/5d2532fc-6d7a-418e-b7a4-83d66cd150b8.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 0x1f52bbe6977beba76d09ea8f308c8318c3a3b6af7bc787dbd4d8b023c19bcca1. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USHM91249407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68734625b0e2691221b40f4722a610dd5a42a776e44e0dc5d15bcab4bb16fc84. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/USHM91249409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567b8a06a67084c967a2343135d041eb3e446c544b403ffdc200e4d3d37c2247. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USCGH1590849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f00ba82a20726e787728ac8054ca8ee2b8bde7dc106ff97cf932f33c0f5409. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/USCGH1590850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fba7f807fe7ec55a389d3246b42616f0953aa687e80def028c00d2b25e4f6e. 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/USCGH1590852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7350bfd32622ad507d5e44625e43ebf5c354d98b770e041901e4662ff2b97027. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/USCGH1590856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc3487baa57206d22783d9b64d32f4cb67363ed4dbe5c00391b3e92bca6aef4. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/USCGH1590858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa249bf4468b4f08bc7e985b34ee268fce850b6366d9db0ead7f81b8fd333fc6e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZ9Y21771521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84ce8d491f11af7326ebaa9612b3d60f49747ef636f6efcbc5a54e0bc9787b1. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/TCAEL1985441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fb943c47f32f1de79e6635d32238f1e6013702d50b158f7d6f6d464227f772. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZHN32113530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4941a9b0705112bdbb37325b1e42f5bef51c48470d705e757b9ffbcee1e80407. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZHN32113531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a7da14ba532e94470e0d71db35ef372e4c7e732dd46c0cef21f6c138a324dc. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZHN32113536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ee57aeee68181a78bf7cc3459a1971c6f1dc032238a2314991bba17eca66e4. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTAX2473773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853300a80d4c9c87b4ef039baf27b3a5d81f370146a2cebb50ab65a87a5e70f2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAEU2060954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b38d646704efb60200b486fdda593361a262b92f58498c27227b4e858d714e. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/FR2X41532164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f77b58371b3f916cc032dccfe5c188eadf6220a352399387b9a81d43c7e441. 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/GB8UU2000039.