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 0x71daab07daa6a9c3cbbb55dbcaf90c0eb7f9caeebe0c92eca1035503469992b0. 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/926e1e8b-5551-4b35-9bc2-3cb46f0e10d4.json and https://artists.proofprofile.net/proofs/artist/926e1e8b-5551-4b35-9bc2-3cb46f0e10d4.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 0x26371c4fb8704ee357a9449da13bee72e981cf9b9c08d2bd046e68cc259f80d8. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHZ52206293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36c0966f522dbac604288cef4fee98c54d27ec0ce18451a5cf499386ee01226. 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/UKJ8H2302800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954aae9ea931036f0830fd96cc87eeba12600c2bd1c376025e3525ccff304f93. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/UKJ8H2307734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6282f18586be6bb667b3a28cf4667b61e2647d3a7eed6b2bf10d5a35877e0e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKJ8H2401893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3f007551c9ccc421ba13a3c06e280f95fa038c0852d48f4c7cb73a34f2de2e. 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/UKJ8H2401894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f742cc8e445a0847b158d699d0dd4b2a27c6de792d731ddcb5afeb80640ca6. 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/UKJ8H2401896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca70ad89a1700dd54661d0ffa53823cbdf46c8c3dd7ba74145503abe577510b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UKJ8H2401897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9101f2c13bc4509d5a8ad4431e888df7bd7daa7d9728f3770d9c92324f25f4ff. 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/UKJ8H2401898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06666eb01e63a4cdfe397c3abfa83af565b03fcee66d752253783bc8ea13c76b. 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/UKJ8H2401900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb4980a07a9b9b9d97df547e72d4ae235c91446ec54de7b301c709c0536b706. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UKJ8H2406099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f2f7c2678237f388bf81444054b3884e4d8ec5b16d7719c84b6c38b4207930. 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/UKJ8H2406923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786d34f66176b21c5fccbce7f492a4c80155e50249ffdfd4ad56089ce239db34. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UKJ8H2500657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21527edf7eddc8aa231cc5e7d99aa107173c4c38de4110ce5f29a780fd8295a. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/UKJ8H2502133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48be43c33ec4396af3f7a7eba495ff19ce7c4ac34b8110dfd735e749d7622844. 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/UKJ8H2503098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61ee135658641f892ccc7b065d514eadfa6945b03f9e420ce3933e2ebca9e8c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/UKJ8H2504884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4007ccf5a2e99ac6ac21f6d196668dbac107dd81b34e974ed5c5e90bd38f5dc7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/AUBEC2477025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3d44333e455364565e4d5038c6079e4f1fdc941462a051fa1b304e11550c13. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UKJ8H2401602.