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 0xeaac3a868008247497c02937bbee61807ac7fb80e77f4387598231b4d545e6ad. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02dace47-a1b5-4547-9fca-2313fd6b014e.json and https://artists.proofprofile.net/proofs/artist/02dace47-a1b5-4547-9fca-2313fd6b014e.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 0x68648c26804df0cddd0cb1e173d8dc66e234807b4cdb334cfee7e73a4d1e06e4. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/US7VG1902788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655c7c5fb7b9e64c49ba70f916079fd8dc6b04d009c26c325a3bba55476c25de. 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/US7VG1902789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583b22cbe23e7a62e9072d45a0b9eb6c1f3524502f2943e08c4fdfa9a7773303. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US7VG1902790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c67073dd26798dfab6d0df4e96ccc20b56bca1b15e88edc4bd3066359a65e49. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US7VG1902791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ef1d7ce68c8a846a29ad9acae0c0a4432bcfa9e3658cc144ec71ccc63ca6a7. 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/US7VG1904881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a7f3b32bb5902862d32a3247c548db165cc90d940c8278e697abf07197b9b2. 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/US7VG1902794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45abcba781f4c5be0bd19cf83657bbe6860d937221b08ad2a7d06e6383794736. 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/US7VG1902795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823b21aa4685d36056b2512aaa578bdb6886593a4ced27b898d67409cb5c2feb. 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/US7VG1902796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8964e3d53fb7b0c9f21454d15b66024867224dc5e5c899a8e6ffd4269abf0147. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/US7VG1902797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa653fec29a3d239fa809aea7e17bbff8f2773590b425a263ab23f78b344ad82f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/US7VG1902798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf26f521c2b81b59483e712d9a5d0bab2469623e54c0de45aef693ff95e6cecd. 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/US7VG1902799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02e7178bc08cd179f972b8e6c6e22fcd81aac7cfd04aee23ac74b01689ed988. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/US7VG1902800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12727203c717cec4e6ed02f304cb132ddf56be49b0255fc6aba0d6bdb557303e. 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/QZ5AB2481418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fae48305f8e078843a8289f4c4968f378d890e7a378a050797dc5a2a407ea52. 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/QZ5AB2481419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267ac9804e420ae87ffe187ae471095bf990c8150d244a9d8f07ca82594236d1. 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/QZ5AB2481420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdd39570f169bbc2fe1ffd50f78024156cada67cdeb48bbdb81f9422ed649be. 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/QZ5AB2481421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc992d301decd946c955f60c8ea2cbdb55d3fa90c6341f99aa874f86129a3a7. 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/QZ5AB2481422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76d766fdc47d245c93a81a8db5e5e03fbdf0c276cacf8e0f26e13c3faae5b55. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZ5AB2481423.