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 0x4c3e694aac4ff14ac2f7de3aaaf698903e3442c49fdda28eb264dc260292cebc. 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/72cdc4cd-924f-4223-b9d8-3755277ddd69.json and https://artists.proofprofile.net/proofs/artist/72cdc4cd-924f-4223-b9d8-3755277ddd69.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 0x4bda859eb93b250873a8de8dbb28a3c5cfa692cbf317936c2cdcca237880d7ef. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:03:58Z), 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/QZ5FN2101167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cff122df822785b6ded6d189e29ea232462f53d2a5acbd5a6a8f8ee792bee55. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZ5FN2101162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0e0cb9a4185267c7d5740a2c9e11bc7306c01e70434e78824b6d5f24996b0d. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZ5FN2101168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d39b79153083d1c92441a5ba37ec344e67ef1a3e14108d4601fa69d9a229eb7. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:10:39Z), 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/QZ5FN2266941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b91aa456af018b74c514a6dbe27d2beddf2e372b0eaeb2f8cdf5396841531b. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZ5FN2266919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ca143f1db0372dcff188d3e8f41211a2f73df7ff98c5bfb11d3abce531ba98. 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/QZ5FN2266923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d39b79153083d1c92441a5ba37ec344e67ef1a3e14108d4601fa69d9a229eb7. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZ5FN2266941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29e8e781d9ddf3a9428c80f9482bcfd167cb74945fae7007a4555dfa50bff83. 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/QZTRX2296262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c44a46c02495d31a9d7b2ebaea98e613e91436a33abd648fe3be88fa7ccd4d4. 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/QZTRX2296267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2421ca3b0c21c71badda516c953bbd1493789bf482499f8e0428ee948453d5. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/USLZJ2329509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ca99e1a2a3363d0a119ccd570a300b78bf07952c813b6eed71f78f343a56e6. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QZTV32377729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64dcd530cf8507046de486fc7bec4fb0f4c3eefbb2779e1d2d98331ed3a0191. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ8A2429959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5a1fe93ed5d32003ae1e5cd7b96ea386492d999d4da5c0a64aca2722846d19. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZHN32574770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9935697d8468cae08358ccb26667699c515c39ffb8626f125579e30408b58daf. 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/USA2P2223417.