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 0x3058fd9bd0578830a304195971f71cb18bf8d7f90ef6aa144a0966ef72bdbbc1. 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/943d0fbe-dc08-46ef-846f-59c406eea5f0.json and https://artists.proofprofile.net/proofs/artist/943d0fbe-dc08-46ef-846f-59c406eea5f0.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 0x0d32d01d3f6a6e93905e2f31e4221619857dc8f963c59234536e264559dbf461. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZ5AB2052074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e98bf703f714e4fae4971b0d6ae7ab2306b9372611deeff8a3088a70d4dd349. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZ5AB2052588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026a2e8c9b480fcefcaea57145d7053e1bfc1b236e811fc9407e992586c24067. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZGLS1987583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14dfe5681ab82a9e7b7a8f5505f83be4c780f3de541cd2def682250b8dfe49d4. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US7VG2083037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026a2e8c9b480fcefcaea57145d7053e1bfc1b236e811fc9407e992586c24067. 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/QZGLS1987583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd38dc865579bf77d966eb61a2810d30b40dc81caf5cee3b0e5f3c6b4d23427. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZ5AB2135660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14dfe5681ab82a9e7b7a8f5505f83be4c780f3de541cd2def682250b8dfe49d4. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/US7VG2083037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8598e24c8f93e334d73535986e65fa8af90cad951c7a64992db6e6e50243d319. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZ5AB2069266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382d419d80639896e4b1f9f0c747e7a390c01b375ce37728f8d8fd6647e8144f. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/DEZC62216153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07109140862c7af85ce171334633be0ecf6d25b905c171e7e4211c8ef59d0ab. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZDFP2096283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b50f5daf1ba62d0931ec084b4d837f043dba1b31d938ee93034e8540a8bdfab. 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/QZWV32452619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fb5774ffa045c3e8d29272fbd26b8b82b8663060abd4dc03c77552123a0d9f. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZZ8A2464312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7096e95edbf596e835ce0c4ccf648a8c2afd259e5aaf71ed2603cb1ebbedb8e1. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QMDA62529854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf9e6e39d49a5773f6babba75feda9ccb66138cb93bf41e10f6cd8612c726c9. 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/QZZ8B2516827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb401c248855471a75579d12b540cf32921bfaecd6491078b1e80121428cb2690. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/AEA3A2592677.