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 0x6c24a22058835a65d0d31a545a1b06ab1071b2b9b2f1b7f54ad892fb021b1f21. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2e10c60-82a8-4393-b08f-919abaf185f4.json and https://artists.proofprofile.net/proofs/artist/f2e10c60-82a8-4393-b08f-919abaf185f4.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 0x5c55e97e2f42231d54c7b0774aa59d1a50d8ae4643167d2e0badb447f2a45ce7. 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/USA2P1870178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40766626bf72203b21861c5da8d682dd319bd461cfa0ac225de0a4244acf758. 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/USA2P1870183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c70136ddd5edbbf952aaa8d7b3920332c697ddac117d0c741b5a36fb1fd4da. 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/GBKQU2256958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba399b80288941c291d5df0b5ddfc9edde005b45c2b602af30e99c2f5e88bff. 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/QZK6M2159307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01b089a06c9fb8c3606e564377a136e951f0db624dd41dcb4fd0891418b6a2c. 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/QZFZ72193809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd1fe324068f1c41b87c13931a24fa36ce8c1e423847245fe9044e83b97236a. 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/GBKQU2067924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9ab1fd38c43d01621e622711a5baa7b54c91cf8f163ae3acc6c248db99c50e. 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/GBKQU2067926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948d9617708cffc8ec30e20e17bbca556012f450af1f87762223c5e485857acd. 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/QZHNC1952221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644c0ec72abd9b1ee0fd6e72452e4a0375c458da382ddd19a634a049cdd9836d. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZFZ31956281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4614c9e9baee47bdc4eacf057347ffb0424a169bf4b55054de2ccf0bd7ef911e. 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/QZFZ31956283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e40090f6dc1e59e5d41e66dd23cbbd6cfb8682552e3d33d224fc9b04657a0df. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES61811592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ba92d87d1d32188193208815f0d8661edd08842bf6de4e82334de4fbdca8a3. 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/GBLV61802135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0600891adc4b18309ff1b52977015f9a7d4e95a6ba08469589aa64d9c2676d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:58:03Z), 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/GBLV61802145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a908571e034019c34ce713cc8f0fe9bfa062b71c093f54c9c59cbe82473681. 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/QZFYZ2598458.