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 0x758076ca67a7d424e135849eb6d62009825092d588a4422cca827c441a7b87ab. 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/f2c9661a-19ff-446c-860a-ce5c4ec71458.json and https://artists.proofprofile.net/proofs/artist/f2c9661a-19ff-446c-860a-ce5c4ec71458.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 0xda84efb9d090fd558d5cc68dcc3baaae3e81b4dce3879ebb751cbf55c2d21c1c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLG662200379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee92af875a265ca3956cea395967eb8e669ecfcb38a1d8f5c8a1bd5f50ebb13. 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/NLG662200380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e6f2fb4ada2698583f76c48d1a41ab80fb0c369a29d4863e0aa958dfb190fa. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLG662200381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd57c96c609bb27e40184e62e0c2da58b0d82f8690066eb8d2f589eca6704fbf. 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/NLG662400069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02b15c20dfb82116bdd25bd97ef95ff6e788b1a61124cd3ac6d0c1b16fe2ae7. 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/NLG662400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd57c96c609bb27e40184e62e0c2da58b0d82f8690066eb8d2f589eca6704fbf. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/NLG662400069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b77c35560782c98b8347c330c9bf3be36b2df01e8bab7f771e759ad698dc2c1. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/NLG662400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8640fd5fb6289572766332e3eebb3179eed8ca0dddb1cc99eea87c1262ab40ab. 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/NLG662400137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd57c96c609bb27e40184e62e0c2da58b0d82f8690066eb8d2f589eca6704fbf. 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/NLG662400069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02b15c20dfb82116bdd25bd97ef95ff6e788b1a61124cd3ac6d0c1b16fe2ae7. 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/NLG662400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9597025c4547551c2d4cf63e08341aaded0bce34eb866708fccc28195c7df2ff. 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/NLG662400138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b77c35560782c98b8347c330c9bf3be36b2df01e8bab7f771e759ad698dc2c1. 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/NLG662400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa574ef80bfc934e7b90fa6e9f180ad95b6ebb0071adb2ebaf357a62615bf8c41. 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/NLG662400139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a1c4d3b3ed2b51681ab5b427a21af3a3264167bad334e358aa5cc3933befb8. 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/NLG662400140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c596a797fe406053614a7e0fb84d549c621b2a800ec3cc4d5f45d351244970. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/DGA0R2409536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8162d65fdbe1523bb9c936f506c4b113d2240ac62a71ac9e7d6ef873a552268d. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/FR10S2538782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62421c08a7663e26999a0a556bb6763f7c851926308b0cd3d0e15f90c506e30. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FR10S2538788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46fbf12d6e2796f6efad80b8a4f660d3280022a083b7f715b7b023242d9bd1b. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/FRX282568909.