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 0xc49d2e53bebee087debf81908b8187f4925aebf2437c61d59b78177b408a708a. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3b5993b-d6aa-4d2e-aa7a-dca112e6c700.json and https://artists.proofprofile.net/proofs/artist/d3b5993b-d6aa-4d2e-aa7a-dca112e6c700.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 0x6c03d6159e42655762d6af0fea7f7862f070c577f8940dfaa47a6b55d362dad9. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QM6P41946915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a8e561a0f1baf9cc4778c361221f341b971fdea6b964607513fe1f18dd12b1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM6P41946916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3d9e44b990262be1e17ce507307d020a4350823748868f92cd847a9db22b65. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM6P41946917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2201b4f8147700b9f4282083366225e5f4768d559fc00bd09fed976602a31c71. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6P41946918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab67a917d815adc1be5aebd400bea332ef62a340e006117dedfe52a4e715dae5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6P41946920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e13f3c557efd8188bb288c1458b38f732f0e4d4cbfcb9518a3d735bab02810. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6P41946921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab52fe867c3eae028927f9f36d63f1463fa30432ae921628804f4bc614b7daba. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USA2Z1811613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fbf03b035f5b254e781d1003417b9547eda81fa2cf7d2588eb1d257a3a1981. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USA2Z2400389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf573d0cd71496bde90eded4b182bd2ae632157912bde57fe5677d5f38168e58. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USA2Z2400390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23cb6edf283b4448e871ded60f049cee9feb599d0273f3ffcd4d76a1cbc61ca. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USA2Z2400391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f37fe698961f9319a662a2a7e4c23fbc8d3f344413a90d189edc43baf420a8. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USA2Z2400392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b31e50f63fe7e146ccf0a274f96ca2b2ac2a2be6ec857013306c03b76520152. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USA2Z2400393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a2ee38d40784562a22a023915c56832d7253f33df77bc69dfd37734fba8d6c. 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/USA2Z2400394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f1c5f4b1f9c66283746cf70fc26ef960c137d8fa2a0e341b05b4786d0dcf5c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USA2Z2000813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb4905efabdd3193ce36d5b3e9ea69c08efa8988f14208f8b68dbcac94c4cc1. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USA2Z2000814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16da56a89d685053716516bfbfd2d8ebf188386b98e5cecba4e03478a5e880f. 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/USA2Z2000815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9522e423e45ea9d195b6e92a889b270f26cb71c18087c442457493fb540dc491. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USA2Z2000816.