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 0x12236b4271d1e4a166ccda89491229dc235a48e54974722efc88af3d651da98d. 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/97e33c1a-e637-4ca6-ae7d-6a5245f0db41.json and https://artists.proofprofile.net/proofs/artist/97e33c1a-e637-4ca6-ae7d-6a5245f0db41.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 0x407ade2d99be4ce1dd51d5e84f89ddf8d22fc8706464eb3a730a17308268b6c8. 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/US3DF1103786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81a83b147eed6f32fc96b456b66b6ea3b7d35ff695475e3436d76347c8e1653. 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/US3DF1103787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53848af1be84d3f6b272db1b92297f35d149cb76ad3f6263378cd159fb12bc82. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/US3DF1103788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547148b2559786b52a82e46de42e5a30b913d70baf76b366221f3f88217ee418. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/US3DF1103791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d25b8220651150e4dfe36bd21e5dd313f96f9bc5adecce4f7db20d813839bfb. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/US3DF1103792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2b12bc5f46749d2f83633a7e9932bb5a9ab72fa03f2db348d9827d3fd2ce23. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US3DF1103794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcd7864105df903a1c8c40a50bdfab1f8721338e63e317267d1bd03acaf56eb. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US3DF1102777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec76e3447f6410263d25f7ef3699e2de5d1bc80ebad53412421f41b396304c8. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/US3DF1102778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcd7864105df903a1c8c40a50bdfab1f8721338e63e317267d1bd03acaf56eb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US3DF1102777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2089951108e9fc6d67adf1bcde86808081420093fa8206450f8be30b811fe62c. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/US3DF1102793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179a6c0b3455c611a049bd76b735304937c31a4b7babc7ce9ab9ba712788688c. 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/QM3DF2102928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2c0682f9efec5945ea9a8464c0fb990f826ea3cb9824d0571a757716941e97. 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/QM3DF2104720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab601d0ecb9f801134e97dec35133976674da8cbf78b0309e354f71fb7466b88. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QM3DF2104737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfdfdf01003d4cf1200dc739369f746b4c2971aa11dcad47d0823b2dde1c0c9. 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/US3DF2229772.