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 0xbeb414b2483b63dfafcfd912a64e2a80adee66019e8de96562415d6bcd4c8621. 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/c533fe24-92a6-4682-8e80-29ec3d67d75b.json and https://artists.proofprofile.net/proofs/artist/c533fe24-92a6-4682-8e80-29ec3d67d75b.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 0xc661259cfca75438afa5c84e01267957556fe87e921a2f175385aa657132e61a. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:16:40Z), 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/TCAEW2032821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1a7eea9295cedea8ae5739c8fa41db4a4fc34233a6880ac9c16c03d534dfc4. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:44:11Z), 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/TCAFC2069836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd670125f71a5a8a2dc8aaade437b3f8c36c9da64f18c7c0805ade495accaa2. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCAFG2002031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2c6f0f0c74e6a5f77c36957def3a6c415e973c494e6bbd6dd38a3669db0187. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/PT0LM2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80790fac1dd092566bbb3a01e1ee21a244ab3a2cc1e4de33e6e44c2a893f317f. 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/PT0LM2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2c6f0f0c74e6a5f77c36957def3a6c415e973c494e6bbd6dd38a3669db0187. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:09:56Z), 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/PT0LM2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd22bd804c48517e9af234e4e14901808945a4afd4ba39ff52df1d68f0117a8. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/PT0LM2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280c18d8582b3b71db5a41c2e0e2acfe41a796348de8f6f3f59dd2a85774bf56. 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/PT0LM2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3e6039ae3b7badb462d6ae67affa230c29f1e17ba5e64fb58feb840947b26c. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/PT0LM2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a045b63beb7648f33edfc3b98c5bb4e33ca01a6e5c69f438e33fccd2142039. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T09:23:47Z), 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/PT0LM2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1679ceb6b4ef5d1d46d9c87afbb97d565459c5955ad45e430e09c30c618b0271. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/PT0LM2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117bdcd0d2b5330a17c7610b4f573fe5e21cf7a7dc64d196d113e690a05572f2. 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/PT0LM2500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b80cf75d6e82e1144b1ac7029cdd7c44a000b93a94071560717fb70be7557f. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/PT0LM2500011.