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 0x921205206efa07ec95f1c9fc2b0000b4328ecc65c79b3641e9804a562a75380b. 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/a4abbd69-69d2-4ae2-95e1-44ec9fca2d8e.json and https://artists.proofprofile.net/proofs/artist/a4abbd69-69d2-4ae2-95e1-44ec9fca2d8e.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 0x5240acb3fc2a709b2b681634fc0c278f363f2060e785ad4bece67e2b334d0635. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZDA72539053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1920e026ff46e9fe95bfa51c6e79f869b633eee27434744e1d1112ed2b3ce1. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZDA72539061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd001c6976a87390af2b88652275d8b7f1a79b975f43160de7c443d9968738d75. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCABG1289490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0224ade42a6eb30927c8ff6ba182bb865f6e856b5a9046a8078e3f5605461d8a. 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/IQA001301088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9a1fd0b9c8fdb1616581cb6c6990bc6a6fd41283c8583a8761947592edcfe2. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/IQA001301089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb965a302757ede2eb16740658f7187c1392963d82efc52ee9200f9df83ad1c6. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/IQA001301090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb3862d6b2d0844a94483672159de099704fa3715c9c2fde4ed92eccbb8bbe4. 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/IQA001301091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636fbdc22e2aba3784c9194df5c8ce8d42d1e5a15d4ea97d0678ac5ca16a3b0e. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZDA62427057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e90796c9b8d9818a3d755cb24823330ac9ef7845fc196bcf3c948f7fa22205. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZDA62427059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8aa8ab3313c76aa4acf84b5100e824dd2a744a9abfe296ac5bfc6cd65ada1b. 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/QZDA62427061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c37890988a80a284a9282a54b8526b1f374df1ff026ff5867abac1fea322c03. 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/QZDA62495564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70198d2aa3e6ec37a6b0f5ca1150d20169b95ded1be7c2fcac8ed2c36b4338cd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFF2449839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca7779ea782e8cf5ef684d58621790aa088ecdd2e753ba55d74af1c7ec41da9. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZES92533377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458484e5c4d918f3d0c2c4f1ff2446ecf730bab8e66375a5fdd2eeb9835ebfd9. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZZ7L2548366.