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 0x086b76acedf89a4a0f18d2475291af325887f87988eb0ec561387d9c8d9e63f4. 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/6e5d662a-feb6-44b9-a043-3af0b74fc03f.json and https://artists.proofprofile.net/proofs/artist/6e5d662a-feb6-44b9-a043-3af0b74fc03f.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 0x61ec581e8281b3f674a02dc829f31547b478060c9433489f806dd68a01d472ff. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/HUA831000152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23909f622ad953b0c9ea2f2c9536447d12606dee48fd133a8e0d511e5cbaf4e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/HUA831000153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8167c6e87023b1fa55b719407eca993f0eb814022a7c5eb59d72aa58dca2880. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/HUA831000160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f51c9d5323f76404e15e2caa35e5efdad37e1debf967e7ff304e7a6d846a9b. 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/HUA831000161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6daa4dcb599bd041e75607f1d711bc5ca57b56db02e90590ab0b52a3de870cc. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/HUA831000163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2667cc3d58c31a13647090b1ad2ab40e933614677b7ac97cb8f3c0b1bcbaa811. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/HUA831000164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b492ffcbf97e3bf1e1a4c99790a8c8a3ace02923caf5730b8f31edbe5ee9920. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/HUA831000165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fdae01b3cc2196b8f4b083022a61abcf55c7852a4c8aab5aade2de62b9897a7. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/HUA831000166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86c7b233ad619cb7367a77057916001f3ed627ab9f1a048c3fb7d4e3f33c41c. 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/HUA831000168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921fffc82bc054d327519bd3573d7e9e5602cddd589ffa6ab0cca020a014cf97. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/HUA831000171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a960810fabbcfd359eb5b7fd9fef61338e3916de9d978d3a699a4594fd13e4f. 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/FRX201834484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b64cc5a75b621ea41ad2d6cbedc3bf89cac076f53e9ab378e8579166175e7d5. 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/FRX201834493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7f4e3abb6bdaa376c2cc0f38ff40a724b0f78d614efbee9a51fc07b529f073. 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/HUA612401763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60404a814dd9cedf1b1eef84e7be2f2756596da4da1e7a54b23d37f525404ffd. 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/QZNWY2120285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59e45bbb10d44662ac623185ec164b38734690d4e20afaaa126f1629056ece5. 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/QZNWQ2594157.