thumb|upright|Shirley Rumsey Shirley Rumsey is an English musician who recorded two solo CDs of Renaissance music for Naxos Records in the mid 1990s. She studied lute and voice at the Royal College of
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 0xcdda1a556eb3e661dd910fbb9fd263694b550413e0e571e6680dbf721043ad03. 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/51a5e37f-9be6-4229-91ac-616c68056a3b.json and https://artists.proofprofile.net/proofs/artist/51a5e37f-9be6-4229-91ac-616c68056a3b.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 0x5a04436f30d5761dc38377f82ee60327f1f66b560cdda8672615ddf470610f95. 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/HKI199358123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07b8ccf36862f5d6c7b31ace7edaeda36e704d137fab568dafe612b60ce74b8. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:26:41Z), 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/HKI199490602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4934e1ebbc32202779514014d1f16f87e035d8ee2f786d84fb091f91799c7a97. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/HKI199490604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59ecba2470fc6544f43c334752f35a4fbcf6bca1da7628d7a06924978dd7512. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/HKI199490609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f32f36eb04ad2c0ef80249b53ec2659fe7d85680d1d34fdb4075e1b1d70afba. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:10:20Z), 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/HKI199490611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd566a8a0a0eb9daea7382aed7e8c6b4fc1f89a5fbdd7c2b3a29ed774999b457d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/HKI199490612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf5b6b8b42985115f7e110e14d8eb1dace573f2d540dd01a2799dd1a5982c63. 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/HKI199490616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf4a0f719a8f3d04dccab4c06384a8fcac0f915bcb0aa90ff435fa6b87c8baa. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T07:05:31Z), 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/HKI199490619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd835ab9d7c7998e97ade125aedd59c9c52d501785b22770c8b3ae2dcb2a841e. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/HKI199490621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd981b4591dd51221f3f73c19633f6ae025e859d5718672d56d97c59e9cf7fa5. 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/HKI199490623.
Holborne / Robinson: Pavans and Galliards
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cd5ecbbd8abfbc61054b97044cd1ac9405ac2afe5dc825eab6d8fcbe00147c. 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/HKI199839105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e39bb60a1d160880e78a023ab7af2259547a5817e68143dd3cd2e7f41d0e19. 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/HKI199839115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b24238b3dfb5f38e55b3853eeda4ed6e87b2426d3161af2fbad1e9fce3ee83. 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/HKI199839125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad67486e955012cc9f4bf5bcddabfd45b89518fd2e97c7fce907bea134c57f6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKI199718510.