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 0x0ecf6ba1a6edf9f47270b246154a55f429384ea266d28a36bbeaca956d818429. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfb740fb-f75d-4fc1-9d46-f9dfe616a53f.json and https://artists.proofprofile.net/proofs/artist/cfb740fb-f75d-4fc1-9d46-f9dfe616a53f.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 0xfe70b39444db8e48a4514bcd9ba2fe68b88f346c7480b8ebda2eea226457ee77. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM4TW2294636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5917a66071b9469868007806044da9d012a6f4ea9ae7f149dd91f3e7fee6b462. 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/QM4TW2294637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b2a0729e64aa66b7cd9646eb08c5ed7fc0eb6eb7c67b024c99d4b7d086401e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QM4TW2294638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97da24ec840f47f6a8c83ac2f5b0be2e33089a450995642f80ebcbde28e2f12b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QM4TW2294639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18b11339f9ff9b024df6944883cd8ca6de2fabcf42386232bb70c121b4e9705. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QM4TW2294640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7540c5f3ab4a053e1d8638a3232da541eeb4960ff8f374d112badf73863c2f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM4TW2294641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3a7686b3636f4c36dad03a5537f16ccba632fd52b73c6a59a4f8440a8366f1. 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/QM4TW2294642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01530f70c0ac1bf6e7e177fbee95d9608ced47ba31eb714c9c48db293b23e5a0. 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/QM4TW2294643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546a308ef21adf4f9fb9a2178600f8e1988b2b0bf9731fcb589488d5c5dda820. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QMBZ92491286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9166daa51eba401100d0bd9a88dc6fb58dd246fa7b7b972205117c7bdbb6a1e0. 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/QMBZ92491287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd2a043c600b752c4abfc22f110248e216cdefde73bd593497d559456de107b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMBZ92491288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62af14a1925a48dc9d1763a4b9e6f92480f4f10a31dd168f52494f94859a80a4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QMBZ92491289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd2a043c600b752c4abfc22f110248e216cdefde73bd593497d559456de107b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QMBZ92491288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546a308ef21adf4f9fb9a2178600f8e1988b2b0bf9731fcb589488d5c5dda820. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QMBZ92491286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e45e8676e4c17fdeb960137cef166c7a72ae598fab31c42fcb299c92e2cf3c. 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/QM4TW2377289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5917a66071b9469868007806044da9d012a6f4ea9ae7f149dd91f3e7fee6b462. 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/QM4TW2294637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97da24ec840f47f6a8c83ac2f5b0be2e33089a450995642f80ebcbde28e2f12b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM4TW2294639.