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 0xd4c2d7f2313c8826f71e8743ee9a58dbc55277693b352be26379b3738ae9fbfa. 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/d553e3fa-7889-4f4f-a7ff-ad940d74f478.json and https://artists.proofprofile.net/proofs/artist/d553e3fa-7889-4f4f-a7ff-ad940d74f478.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 0x11783be2e482cd6c43b1ecbcf36205c7d139e9af7dab9030663c6e8dc72daa1b. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/FRPHC2100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf5785818fbcb5535a4e3930ebbe641cabac9aca63618143c5f3d15711329c5. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/FRPHC2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677f273f2b2506157935aeed3a2fde65f96ca0ff724b7b91c89d953a6c58121e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR9W12315399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bd3dfcbadee779339cd342733168481d77b90586fe3db2154c678a74efc100. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/TCAGQ2208996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55a5056b07683630c2f94f1ff8ed3e396c266c948f1a3155a66e2dc6d5c378d. 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/FR9W12334965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e9e2a42fe9ad638e2d89f6094e72466854fc68d0c427685ac23604d35753bd. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FREP12400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b19cc51e49b2c9a5680c1a65c907b7a964fe9296fe1b2f0ec019b4899c1d93c. 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/FREP12400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946c5771af12ffc75c8eecfda82e11c155c43db8d242161053474b72101ce360. 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/FREP12400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726e2b962f282194691fe81e5630b075058e7186c9dc785f34326e6fe196fa6c. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/FREP12400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb79987aea0f0af6c1a441fcb218fa3e199066d56cddaa1f0769506cbe4aedc8. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/FREP12400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf9f6ededf854c2b3793ecb4ead99b1915572652530e3081ec64387bea42678. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/FREP12400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e612d753fb6bcc749658a3e1dafe972f3643fd32c9b46fbe32ce4a82d0546c. 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/FRZ052200439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc18a7fd73b5e73ac528f53ff6ebdb677d90087a49d98f3c80c0ae132849fa3f. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/FRX872111234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d15d32737c166ac624acdd35130c7baac1e431247eef83f905bf62949f48437. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/TCAHM2349191.