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 0xaf932c89646267cab8d81e3cb717b36a2b3d5718c799d62f170367a9f7c1efe6. 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/0d62e172-cda6-42f0-9efa-29e3fe929578.json and https://artists.proofprofile.net/proofs/artist/0d62e172-cda6-42f0-9efa-29e3fe929578.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 0xd292225d6559a0798ef6bf955cc817dd338cd834bb7cfbf42e4b35b239f7a12b. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZTB82203812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7f16839b6742ca8ea8ee6e82fd35d5f09bae61f613f30010dcbacbcedc59b6. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZTB82203815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1761f6a434758a11fa66eb70a57e1fcd7b611e23f1907514d4010fa909bf77. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZMHL2366289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425e393b2555d6625f9521ad3d7e3861d1e520d516c5ea8d37bb2d7087c15b11. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QM42K2323160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b1ac7c5be3cfa110fe977e0991dde5c06f16eeb99b702282105d7b7296846b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM42K2335073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bceee7adf3bbb85e561e76368cdc350f747791083e5f4c2ac1c1dc2c81081d7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZMHP2384908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570d49e1168884625140598b0736ec541a039f252e8d71bbd631df56c401d2ad. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZS642356722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477821f36007ff038eb23964cd5d8560e51d8fab82b1f41d5e7d7fbb6b9b9398. 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/QZMHL2311960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0271ac4265aad43007213b311417309534029fe77f4fc48220f5add88544a96a. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/SE6I32434490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b5b35d0e01d0a3fc86de67398d770607ba69d02697578360a4746e4830c258. 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/SE6I32434491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f810148955b6854a9e5580b7eb9e1c16655115e2a5f0ec82652c23a741ffa1. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/SE5BU2565979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe631f1153c5e0b5fb94af831a5d9ea1614366d1281b4a24712cc0671af006720. 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/SE6XY2579161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f810148955b6854a9e5580b7eb9e1c16655115e2a5f0ec82652c23a741ffa1. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/SE5BU2565979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc769b4dc35f6794abd699ae2094b3ae42c4639e23af137773732d61c2eb6090f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/SE6XY2579164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b235ee175c7b1c263c3ae86d721e059533cdbd6040e7e2ba97c21224e91514. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SE6XY2579165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85e37b0aa5e1763a47a0728fb7c78a39c6ed784165efb7c3efaa080a44d91ca. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/SE6XX2588881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26285e3a4878c4c910edfdd845f5e70450cc028d80221699f182597bd4e8d8b3. 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/QZMHM2486290.