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 0xde9214c318088b3c8762af764e15145a271e26463cb3d4ffb58487d368847b27. 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/724d855d-3b1e-447c-847e-d5b2ea0fe0b4.json and https://artists.proofprofile.net/proofs/artist/724d855d-3b1e-447c-847e-d5b2ea0fe0b4.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 0xd9047940c5414e88f886b8960d98b2ac61e5e7f59aba7a6cd08c1d9003ecfa68. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QMFME2177436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236f682627c73cafe762794d44aaa5bdc834e18d13c698a02c0da2b9d9103c2d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMFME2177434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19defb1405138b22c0322e7ce165bcc12dd1cd12005b13ca0df2b5ba8859ad5. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QMFME2177435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3756ee0827e4229de14b89d59c13c89c64bff2ea9f40fe97c55cba8fbe39cb9. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QMFME2177437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53dc88d85afd2d2d8044ae6102d5d0a8126a789e4f7a5d67240ba995c4b7c2a9. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZTV32330178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3aeaa2a81afeaa3bbbb0bb58a01c63acaaf1e91a45bc3c9366bfd7750e96a0c. 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/PTVI12400617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84faba553c59a6961c967ce869f1504f1ad95e2918d97a400a6f0b90a956952. 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/PTVI12400618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc58a2ede86bcd1a57e1be9ee99008a6a0a28c3392b4f970f2e87e9ffbf23bf0. 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/PTVI12400619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba874f818efbd62691d74e045c8cf7f12b1ab62aed1ae14b849f75066dab9ec. 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/PTVI12400620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c666472c934721de9ad37f44d7228c7121e798a204eb13a90992f8dc795a05. 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/PTVI12400621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1234471fb6cef23d529b1cbf5cac69abc19c39f12849d0bd314bcd95deecd9. 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/PTVI12400622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79cb48a591f4d2867380c8017a47d79f4a88e20c40f38dc46cdea0f867be9e59. 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/PTVI12400623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed518effb85a92dc37346c772fe13d1caac5be49f443de04956d47309dc29e4e. 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/PTVI12400624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdecce12c7f60a4a50307e321b41a5e4a2f4d70dab1e67da211857e6050f9b1c8. 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/PTVI12400625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456cf0d4751fe3592cf0146e6c52f49042704f495ab28f8f33774d3691b660dc. 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/PTVI12400626.