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 0xa7acb8b1785b3a901f8a3edf281d40132a5073e673d02c1a5ce36d7ffdf182db. 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/c1081b64-6d1d-4fd3-9697-65ce33dbf3eb.json and https://artists.proofprofile.net/proofs/artist/c1081b64-6d1d-4fd3-9697-65ce33dbf3eb.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 0xa26ed6a52354e40eebc2edd98ca53b864923a7faae3a3185aeb477ecb8077739. 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/QZHN92180902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae75b0c727e3855097a9260067895dfb4d8a6c8a6c65141b212bf97a276eeca. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZHN92180906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe275e547063dac290cf6158eb9e016fedd626f46ad9d89607abfe0fd172f6612. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZHN92180907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35f0b88a86319772e849444de2ed56a4461c177b3c7572e19ce3c153f93b781. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZHN92180913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e17f6ac191874b8c0ace127b75c4d4ccb166285ec51f870eae654a8590a2b1. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZHN92145934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106c308ba2e7d941a9cdf53986e457a7247cc1305f24843cf927aaf221eac02e. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZHN92145936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f885c9c7a25753a043c5391810b9da9466ebbd6a19a720b0df7911abfcf3d9. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZHN92145940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee38544a95808b82408082d07c70e11ef2c978626d56fd212da198b82aa9a873. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZHN92145942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b82359e5ccce291c0a972bd446228c8860a6f912b9c197e369af1c2d6d1fad6. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZHN92180826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec1aea64e6a965b88e7f59000854531f4a049cce60eb83e50c73b1a8fd3b8ca. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZHN92180837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bffcc94bb832938f686671a2ef1e59be3dd01f284bd14f774382b112ec7dd0b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHN82194557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99aa2932a316c6727dc07a24beb240d0eca924aee4919d5d863397a9672a2d0c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZHN82194562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f01ad0903ec6a276edb28674519ffb2a5c33fa6d6269d9bb0e4ad6edbf60e44. 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/QZES82015317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f01ad0903ec6a276edb28674519ffb2a5c33fa6d6269d9bb0e4ad6edbf60e44. 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/QZES82015317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a64a42c80e3f80667fc93081490ce0386242e55ada479020d6162cd9c65bee8. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZDA82085330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eac052cf8bc5d9cc606fb08e2eca92c9612428176803c82a62201b929bfd640. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZDA82085337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed012720b204c2db4b93145996883ef287294a9802f8f603b7cb2b5f698c2fa2. 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/QZDA82085331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97f567518f2d165f3a56d01b0a90d36ec7219b3926cba4712b390294bc4fccb. 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/QZDA82085335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5980ed9f3c5c2aa7ab3348399031c3cf29e6bd0eea9b4d8a9c54d5c19611c6. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZDA82085340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9484a3374e1addcd0fe978985f4dfd836c202a1737ace5da06c9bbd120ec4c50. 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/QMDA62450594.