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 0x2cca6ac8bced01dcd002501f72333a6f1867fa96abccd88e1863ca17de157731. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b20d43a-269b-4027-b42c-3bbc7f9265e1.json and https://artists.proofprofile.net/proofs/artist/6b20d43a-269b-4027-b42c-3bbc7f9265e1.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 0xd8d409dce1bf4613a60295d4edd80cf63de27d42fe4a0a8bd1b6a209feae6e39. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMDA62284409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab929edb4f85865261cdc229459880598c10d390a42c7cdbf86845840e19d43. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/GBKPL2283293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d409dce1bf4613a60295d4edd80cf63de27d42fe4a0a8bd1b6a209feae6e39. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QMDA62284409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0982b4186b014f2a9325939e5b6781436c4d3be11282dcf9e1ceb7dcfb0c961b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBKPL2209917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaea39761ed4eb721c185f05501ba70139e66fc36a76495b8e1aa9fc9048a8c7. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBKPL2215012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e9a5fff63bf30493fa4bd84d2050792ef83b7ba2b6615b732b243df4711edd. 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/QMFME2240413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83048f2368b02e6e10ae42efb7b43543783e5b4b718f669f841cec984c00a0f3. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QM4TW2404992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee207d61594c1c7d68eb2240e57b12db11d3a784ce0fe20c5a1c84679ce7e36a. 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/QM4TW2444418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b9cfeb13997e765f5af70ca2e65a7462403cdd1d66a42fd6bb6c755ae74137. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZAKB2458013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714d094c501e353230f980e982652606f7ed1e62bde2289acc32edd487dc6d6a. 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/QZAKB2508013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d41ccdaf79aeeb1951e5afd5d38ba277bdff662bef74ef69046163473bdebd1. 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/QZAKB2508014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c070e7b013af1b9a702551f2ed44bad4a91fc0500d3b9fac377debc77227ec4. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZAKB2508015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59d0b25435db0e73c7c5c3f4c40882bfe083c853d0660354f0c6fd49325da87. 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/QZAKB2508016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c18bbcfd297b3590b345d2279cf484423afdb74e845207fb1050f40f1ed246. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZAKB2508017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2385fd9fb715e7999bfc794df50bd1326e9c502575f9c5ac2cf2272ddd33891. 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/QZAKB2508018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510307ffcb51b87aab772cac9145d2234c939d810e27b7d83b935e5787849ea6. 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/QZAKB2508019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3cc166b1511f45f601e41a99ffe2d92bf3f07c76504aa8e1d84e7c0924145a. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZAKB2508020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b389857b27a4f6bb27452a2f06456f0ac411dff6019b32c33cb8d1d679bc769. 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/QZAKB2508022.