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 0x2a123b9940b9d99632bd09d771eb2884abeede09acdd399dfdfd94bfc38c8044. 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/55259bd8-22fe-446a-a54b-192ea0d94803.json and https://artists.proofprofile.net/proofs/artist/55259bd8-22fe-446a-a54b-192ea0d94803.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 0x6dea45104beb919dd482ada23884b8011be806d4a2a8973e9e6f97d31865817b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ATME81810201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e163cad09e4e70298a18fdb0e4a51760f0ad6aba81b17ef9ad3af4e0576b4f6. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ATME81810202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09c7bd600939d067052138f855e397e9d2847f9f63cf15cc0691407c7712bbf. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ATME81810203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7730483411fb9d6000c87cd3dd6e99394d804ea174e3ec71e5b7c1e94917d86d. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ATME81709301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c56b62336fcb3045b39b483cad109233e3f6cc4caa4bb000b9a03674a8f8282. 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/ATME81709303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70bb4ab9cd941d0327f9d67e3746f60eae9b0a545c22ed1c88186061aefcfb9e. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/ATME81709304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be756baa276eb6dd960b951ce96b81387c1238d194dd0660cf4ff7053bc58d1. 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/NLCK41049083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3e7a51aaf3aa4b9c2f4987d0c686c8c2f9c9365ad5604d57bd599f197ecfc3. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/NLCK41035067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56970dcd3bc0fb6f5346124400c80f9624bd85c5b50af8db6362815c72768a7e. 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/NLCK42215046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65228bf48276e80abe21a65075fc3df655582b88d2639b9e5176ca5adcdf3833. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GB8KE1858012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7822ad33de0010da309eaa51ccb815647038d5378fc8eadca3ba06fd6fbeb047. 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/GBLV61904132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x355c734842b8302b841173ac0149c1eec161020e9f35ce6de7dfb0a9af85cfeb. 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/GB8KE1854498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bae1c103c5a1f9094a26e24b74d8162c037f974b2c31d293db2d4ea3fac323a. 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/GB2LD2410231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a786aa758532d43982e5f868917291d67ff7145452f72d170e20212be84d38. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/UK55R1600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe798ba40e4d5237bcea1c14aa060fccb18df2eb52a4dc9de4e66de45b9b93860. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/NLCK42400115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c27a3041219878a4522805d321aa2f78b83826d707ae399e897b4f5318875c. 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/GB2LD2410262.