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 0x07f3861a2110fcafffd6e2449e689bb9afa10f48eabe6f53dd3b1e7ba855e54d. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a9c2ccb-3c4f-4616-a213-18d49ea4226d.json and https://artists.proofprofile.net/proofs/artist/1a9c2ccb-3c4f-4616-a213-18d49ea4226d.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 0x176628f6458625cdf80e06afd8501e359d29d2601a5098f53a64147b0d3c009d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAJJ2504701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9e2dfc14142cf4e7ee135cf38c1cc03d8fa2604a36266f938cf068cd072f42. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/TCAJJ2504703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a5933f5f08293c1d18a4b37fd251353a594f6104fd27c4fdb364e38287986e. 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/TCAJJ2504708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89517575593cf7d0d83908bd36b958386fb34f028fb0ec7fb606e05caf07684. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAJJ2504710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f20395366461860bbbf19f6a705f51fb127b2df68ecafc289d9392dfef09f3. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/TCAJJ2504711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd79707db707babf84ee4b5c741b33ef25a8a57e61c9bd58f32476f1271972ed. 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/TCAJJ2504712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10bbc91d55f8c16550b29995c2808b32fdc8329b695d8f3b7729664c4191f954. 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/TCAJJ2504714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ad63350e1901e74b187d2f053958c6738d7db5d2b7c7840ea5e5941a619d0f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAJJ2504715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08cf4f63adf8fa10321ce2c8279dc96194fd50e95960c04dd9313a3f8877a48f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAJJ2504716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54295aedf141e9c864e5d7651950f492ce884eec3589b13ef97e2c8caaa75852. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAJJ2504725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7700dfebaedf4c2b116b0349fff06a893c6663b2aa390b238d4d244f06e75bd2. 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/TCAJK2504728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7651b6ffcf84a146f747139992374d51ce8f25c6a87f51b2d8bee92ff95a89b6. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCAJJ2504729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afa1d9f50425693457f59785237814e3e3e8bb3a4265699491d252436104791. 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/TCAJJ2504732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a6dfd887610a2cf446e130cd8407e2cc35adbb87e779bb99d54179b1f4fad6. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/TCAJJ2504737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56ec13525f1ae0e6f420b10891292848f561c1f33675c73dd1032f4b6fe0789. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAJJ2504738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c2d64dfbe8aaee3577fdb88765291eecd6d9d9ddb04ac870f8b2ef69bbc75e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAJJ2504739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead265ae5a5980e07a6a836c53d86bef20b31bbc200f285cddc62307b0202a07. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/TCAJJ2504742.