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 0xd05a72b71aa9224d41dcfaa0f311738bb43bebd2ad2f5b0fed2f208ab036c708. 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/143b9451-3206-447c-a57c-da28d514de54.json and https://artists.proofprofile.net/proofs/artist/143b9451-3206-447c-a57c-da28d514de54.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 0xfa6767ab54afd1adf792304652bfba550c1b9ca99f2ff2d3a3ba94cf4452e9b7. 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/QZHZ62001492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ceb1b7ccf88929f68ef237f322d9b485f33b1e248a31f80df40ac3c10bdff3. 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/QZHZ62001494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1199db7ee2e81b045fb2fe6ef07c6fc84ae51d46ad0d50f216798c51f2674bf. 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/US7VG1871006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aba992114e46ff7a7784403b47d0bd6bf90c98e781dedd7b0d660c9b542021f. 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/US7VG1871008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f366a0dfd154db6b08a089b2d2ceee3462311fd0404ce7a9511d94900b1fea. 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/QZZ8B2397189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1713fe9cfae9f74c442c887739dbf8590b93a0ee376aa1c5396365aec7900217. 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/QZW9L2309462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3526ee14414a1b7cd1b6c11412ac7fcd3ee587dd2fdfaa0696a92abf7bdb9d28. 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/QZTVM2385741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf056e3b4e68629cd9e78d08e54f94f719fae68e73ac52243652724c8ac06ba2f. 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/UKACT2371945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60dcce51c4476663040fd3ef29906ade170f7306bf543c0be86d3df3012709aa. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNJV2399772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e641b8e250518c977f4271c02adb90fcae44f13f9fbfc9a683a69c84cd061c3. 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/QZNJX2528699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a833099c3e69a35fb727e2c620b9cfe8a29df0e2eec8598164a5a8a4572e385. 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/US7VG2512305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044ab372ddefdb2c8102cd4155bbed2461ceb9a65e2bdf943666200f2845a9cc. 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/QZMZ92175151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1415e2e68e9e59a1ba5a71e288c2d57370991c2747fd3535666e94279a7ffa38. 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/QZNJY2306228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8499662f57c4482c5da36b9100326b7202849b8c483046340faaf1f3a09f966f. 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/UKXN22262487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4324fa5bbc3dc2c07f693e5c8b289a2bb1c9743dbb14732dd373b5c7fe990a0e. 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/UKU932300308.