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 0xc1047a5fefe72de8ac64df9072792ab983c35740f3b0de4ff5ef7d358bfcfb34. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e69ec25-7179-466d-a0c0-4462d57f3be0.json and https://artists.proofprofile.net/proofs/artist/8e69ec25-7179-466d-a0c0-4462d57f3be0.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 0xc59ea56c9d005ce8bc495ac2cb404fc2b48a226a4d010decd1fe919472f9517c. 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/USHM21614650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad5cc6df3f18bfb51158fbb0faff86841dc22d42101f07b47e0a7648caa01a0. 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/QM4DW1895719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6e29cf71df5696ec8e765eb4909740d8eef5f3a8fdfa6cb6deacff8cac47fa. 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/QZCE61819526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ced1d6ccbd9b1d83c27b8caf19e921e9b6d5c116ca10344bc6fb732ea0cac7. 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/QZK6Q1960591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c273ab826b6a233bcdc77c30bc010533125d56a748e40da814f5665ae891e4. 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/QZFZ52084236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70359e0e01dfcc4033bc91b3809f0607ef00ce305e32520d9dc9b2c341d1922d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ52041945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4faad443614f51481fba1b86893353790bdcf695f42c534bf2a1adf391322657. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZDA72031636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35474f28c8b472d12268478cc3af666ec80ec500fe495727ba83814e8edf3204. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZK6J2085108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b59e0b1f4d1c458239b82a019b957da79dd60f5c0253b896cf8fbc4a076e8b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZES92175494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc7a5531594e64ba9c9d627b4d38fed70c23ab3fd8b3da829d26f8a76928b92. 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/QZHN82172816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffe34b11d4e92f1cc0c06f11eea933c91a361b4ae0e6b0e4e4c4d23b0338cf8. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZK6L2122273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f108c56e4ecb193e6aa02d9cf10a5400679f45d8e2129ea436dc3cd1c6f95a. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZES52359168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b59e0b1f4d1c458239b82a019b957da79dd60f5c0253b896cf8fbc4a076e8b. 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/QZES92175494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f108c56e4ecb193e6aa02d9cf10a5400679f45d8e2129ea436dc3cd1c6f95a. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZES52359168.