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 0xf2bbb1eddbdf9d4ab353c92e41fde960f6c797f0973d691f9dd49e283f2c8cb6. Chain 2 (Bitcoin): anchored in block 954017 (2026-06-16T23:38:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3653d46b-6755-4563-816b-881c496d462a.json and https://artists.proofprofile.net/proofs/artist/3653d46b-6755-4563-816b-881c496d462a.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 0x32491a4802ec39f3ce2814f41697d6885439e616d26aaa9258b9a9b18afe30b9. 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/DEF459922419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0261f75a8d64490c03b18a702cc4e485ea6aeed262f101c1f5f7a1f969315406. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/DEF459718801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dca848141c8e0b46b1e40c6ff7d2fb8aad7ef32b9c7acb2e30ab8b2bdeffe0c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEF459718803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b7cf76a134e872ce73eb0c1f1d15b9eab08deed41956d6d87686249b4c9ed8. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEF459922418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245a1a005db367ae1176a97e1a78877a1c04267fb8b8afbb2624140aadf21f4e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEF459922409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acdefa5934209c2db4dccae02563e6b3b4060f7cca7bd23d6b2d9469c089f9a. 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/DEF459922413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa2c861ec81ea0faa5061601948d4e4ec92a652fd7904f98f7d0ee7358e1956. 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/DEF459615216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521b3d11575a2c3f383279fe081b8a07adb252646e95205ba35674200c23f784. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEF459718725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd67c825444e052a206c906d4d5ab80a19b2245925a13226ebd5f0c8ea7fef5a. 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/DEF459615201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d03c619e9dd3a2cd4c49e261ff6f19e16eaeaaecc44a329e944e8239796d8a. 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/DEF459718804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc894070f79b8e430a0d1349a2241ceee8dc0ce0c02ac3e8347b0fa3a71c65377. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/DEF459718723.
Toselli Serenade, Chambre Séparée (Medley)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d2e8a288b37a89d37463d74aa87d78ce8ac9bfccb500a3491c505f755ff277. 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/DEF459718722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d4923f8dce919eecd35ffa8e2711e0ff79157049b73d9f0f8d2272b812f4a8. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEF459922408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d609dd1b6ae9bcfb1510641b3008bec052044705e8706d4d3edb71d1fff513. 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/DEF459922415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17fc79c66d8adbad6b5ebccb8286374254cb8c60e58d44527cf01591d3ad966. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEF459718806.
Goldstücke von Henry Arland & Söhen & Russische Freunde
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06da22043f045a014ca09992ecc8068e62b60c546b27b3f5ccb10f6b6faabb5. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEF459922406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d51e9bd05fbef00335a74f734524dd34a7ff4cb7d894b7fcbd433b49f19467. 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/DEF459718802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc294934f8ae430a9131372f3517ec18d520294771f422ee655888a6d50488e03. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEF459718724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ff44a5778d4b0be5de860312e50b6bfe9a50dab263d8b76b41673d109d5ef0. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEF450227001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2273ea55658a6ea35fb2b22ee5a5ac57afd2e1a410ed167c44e9ef15dd9695d. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/DEF459615209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2e6cc1435ad17510e22a2b3989b4428aa47e3835553e73c356163775a50901. 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/DEF459615213.