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 0x794028a2f5aa699faa1560a72e256fc6d4fe96e5b74f585c45ddd0e1c2a451a0. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62089b54-0d2e-44b0-814d-4f2eb3b78a3c.json and https://artists.proofprofile.net/proofs/artist/62089b54-0d2e-44b0-814d-4f2eb3b78a3c.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 0x65a9d4407fcc744c01b84b65dca63ddb01ab3f93fd663b7f7517f601eeb169f6. 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/FRR642300360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98213588156db79bf16d3767f416e486543bd441eb936b084310c2876f78b6f1. 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/FRR642300361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1186a01f596138d433bef6d42150f22eb984f7f13278ff27ec69449e6e4a2a. 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/FRR642300364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56205e1267c556a34452424b2f527a46c682e53a9a4a978f8c10382ae8f13b78. 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/FRR642300370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f0c730db4e1ba7989941940a18055316a4028e0fcba8ce549078bd09471c7f. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/FRR642300377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dbb91c547fb8e3161c61aebfa4a202df89a8f7eb2706e778bc4f064152dc9a. 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/USA2P2135532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f83cf45603773de0c9ebf831ed03effb3ca3ef57ab33643d0d6421cef4382f6. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USA2P2135529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28773f3589f5b37026266862d25874f53115ce566265cb469cdeff3a1bdd865. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USA2P2135528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fcb4040b0160e16caad1258d0a3ff79234206050f4b35050e2fce2131b7a349. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZTAT2334034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70a11a367d7f712b5c908eced68475f0334493fc65cca71ccf4c43ba7c8d7d6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTAT2334035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12b30a2a25191c1d178cef6a088ac3bced2b997d55e00cb9f276bf517412cb7. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZTAT2334036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ca96ad1d07ef29f0b2ced9bf504e07de25fbc5743aa30078b59fde6220b808. 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/QZTAT2334037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273cfd0aa9e93cea64a117725891e038361cae713f186786164a30d505a36b0b. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/QZTAT2334038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab3ef8c53e00c4ca91564bddf511589dc79b55f0734741df1ccdbff0d1b7b71. 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/QZTAT2334039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96f901b90e4f28a427cb218a3c6eb25d337ae51b2363d2c121ba7df69b9cd80. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZHN62401201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3059cc2da53503142c0839e7c176ede57c195f94c7ed7dedd9a6de1a6634b59d. 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/QZTAS2239175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec46e34b2eede22151353e8ccd02abc109ed7b8f184c94d7ae216dbcc87e1027. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZTAS2239177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbc34b32bf7834829dd9ec7ec4a328f8c06715a1426bbd60add54edd4307011. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZTAS2239179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a83453314b8d6727b431ec66c3e14dcbea67e099e2e9681d5d79455a224c21. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZES62300351.