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 0xa551e4ea3491e5c6a93ce7e17c8177136686360721b4654775e4a9502a425fa5. 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/8696d93c-1057-44d5-9716-7d513bf8ca41.json and https://artists.proofprofile.net/proofs/artist/8696d93c-1057-44d5-9716-7d513bf8ca41.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 0x901d9c585c1d04384e54b7d7efea3a241e257eb982059ca97de66c4f8a7e42db. 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/QZL432200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901d9c585c1d04384e54b7d7efea3a241e257eb982059ca97de66c4f8a7e42db. 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/QZL432200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cf822cef969320beb3f4ddcf57d2c73f5f5bfcb37fda37950871533f39bf33. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD12400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0442dbd8d8af7216019449bd95dad5e7dd8e9105707a74a8cf506593e96196. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWFH2366163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373a0ff13b6e35aec3d4a966e4094b7767adb7d99b10578de523e7e83c20c8b8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFZ62440761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06813656c99e9d8470c217f056b560fc6a2440a61bc017f774697795d9124dbc. 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/TCAFX2184969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdee806496202b3435c7cb252a5209ce5a7b94f4680d205bd7311c73ef3c202. 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/QZWFH2366161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4f502887c9ecfb794a151d16ce554519a6b9868ba78ad22fbbb9c74c02e7ce. 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/QZFZ62440759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb0867ef522e4c15e1c3e2e62217a2f13269c1012cc26f0000a5bc116c4f36c. 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/QZFZ62440757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764df7d9af24197528f41b5e39751fedfa60670d7b840410eda89b0b400490e9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFZ2232670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf80be23bd4f91467c7ea932ad034abc9b7d577292d88f53c540ddc56cb3382e. 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/QZMEN2445379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bf1aa856a3800ed71d5f1a250261fca3e8e1c9fa04f5d92b5083edbce442c0. 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/USA2P2233783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96c039961b39c92bc6bba4d6a86f61b09fc26d5ea2ea46b384aea3b3c1c301e. 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/GX3Q92425308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc237de3a64dbfaa64b8d96cfdaeb510ffad8ef5e592d473f60e6cb60cb364d8. 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/QZZ7M2446792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf80be23bd4f91467c7ea932ad034abc9b7d577292d88f53c540ddc56cb3382e. 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/QZMEN2445379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ac54a2f0ec02424842ca0a0a559a5353a74de6d673890e9df6891b1f4ca89b. 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/QZZ7M2446794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0ca89158280e8616c4b7b12c61732e1a87f2bcfb72caf7542129439d989d16. 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/QZZ7M2446795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7006c2baac6a77354513fe57293059d765fe72bfb2435759c92e9256ae9b17c5. 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/QZZ7M2446797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9686c907fae854a37bacf03e9d32d5f9936780ebb89f403a4cf8a8b75da84c. 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/QZZ7M2446799.