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 0x93ba8f3b3da7765a8cb54de81f7226db0f6f70ddfb0b16fe2817a065e3599ff3. 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/c09134c9-1593-41ff-bbbf-9fbb2c164eb0.json and https://artists.proofprofile.net/proofs/artist/c09134c9-1593-41ff-bbbf-9fbb2c164eb0.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 0x4cfaa2265a4a6ea4234bcac6f943bb746b4c260dd2a3c54cad4969dc82ff2a2c. 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/TCADK1770575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a36cb48517c057e5009b6cb9b1cc2ad9e55176b1d911b7e4bc59728bcda38b1. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/TCADK1770621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed881b5e2da3d42dbab5c33a036050ec5d26bdedca71a1812d0fcc32089bb7a3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCADK1770641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9391509f528888f8ad49a629720037421fc4beef3b376293a4943fdb3548ebb8. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/TCADK1770664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08feb78c0a8f497b20ad5883215fcee8bf4ac09aa908d2c16b73c364ec8e888d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCADK1770670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9233fa31c73ace927734dee6f2908854be3b354a771727aad9db36f9db333c1e. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/TCADK1770671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58358bffe35207099d697956480e49605ebd2c1077d5dd0a299e2cd458eaef6a. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/TCADK1770675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20485024995dbefcbdf88b2eaab3fd7da996162a1711d7777ccbe47121f1c5bf. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/TCAHX2462267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0809cf5b93bfbd14517092a9753317d74429c43138083101606257708168bd. 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/TCAHX2462288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18b873d22ec4a620e61887d3c45be62d8e165d0da84c894838ad441b9547737. 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/TCAHX2462338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2579e6783bcedf710f7eb6e6a3c35cd2acfa402677e6ab8616ae4c42cda337. 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/TCAHX2462369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e0a0610f61b51f950d9a6dbdc57d3c4b660a43517b0c95d3b09604af8dd0f2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAHX2462374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c364011677b9530abd9185ad6527e056f624e261fe9cd63e1e24e49adf903b. 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/TCAHX2462396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb0b409b9ab8037aa96ec50014d1697f38092db6bd93fca64c8b099de357211. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAHX2462407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca6323e4b4afd2a4ffb311195e2a9f890d5148ac37ea98970ba8e5444020921. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/TCAHX2462425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ae3dbd544f9be6b35da8d3edc3597e9916c89e523062c7e9e9f2b7b10ea887. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAHX2462434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b2a7deb4c8b0bf912d4a427796d26458f6087cfa4563aa4b673a820d118fcb. 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/TCAHX2462447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309c440e77033ca12a8d0839beb9dee5f580320259e2c8873cc160f59049dbd1. 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/TCAHX2462466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f9fc14689f0e54d34dbac03160813ae4ef75b744b9239d4939de3959092c0b. 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/TCAHX2462474.