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 0xcdac9c235c0bcbe6b24a1993aedc4918183cb80ed0b26ea22e3d27f96e72a050. 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/dca2ad3c-794c-4a21-81f1-248edee23fc2.json and https://artists.proofprofile.net/proofs/artist/dca2ad3c-794c-4a21-81f1-248edee23fc2.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 0x7daa53b89fc70b3962353d16bbee3a3d90824ae0e06f02d8574f19355795bac7. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/PTEM18700092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb126f7ddb81d0f671ffc71f98db0d4316e962642fa4b625b79ad6dfe55d175bd. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/PTEM18700071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e11bd1d33ddc5c81676c80b65e77d30a7096df36fe2ff06ce02bc8d3490f6d. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/PTES10303702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac151a0213ecd5351c4a7748d2c5a3a7ec1b58c29fb5a78dbc834c7d7a2c98c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/PTES10303703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1073319a3a2f7663b38de5b9f0ead7bff9b7c9f66194831b554a73944672c4b3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/PTES10500401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2554e393d6f5a09001a0cf46e98d6a186225e96b9946b1d27c5cf636b4e2053b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/PTES10500402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b51be2da0f3b690f2d97114e25eb853c3024a0df7902033b6d91a852769b56. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/PTES10804001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529f234bda8995c5e28a7afe8a3c4dc983ed888f243002e28937ca638a46d7f3. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/PTES10804003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadaa1e4fbf86d302a4ebc6520037db6782c7b08956838d1b3ef858d79cfaa670. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:26:20Z), 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/PTES10804004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e7a17d2e51ddfc321d2a3e3919b0aed893d462d5802461aef1e58343da94b7. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PTES11405601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbace71feab2a7ac1169b9a12bb0008a5f2a4d8cfb8374b7fd545d45ceccff29. 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/PTES11907910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab70f629a40ba8d7af005b4fd43a96d9759c5dd858aaf3aa9a7ca430af24406. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/PT2EO2100270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c7c29b26bfe2d9b5b8c0490cf77a61b4a66e477e10636469db0dcfc4640e46. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T22:01:52Z), 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/PT2EO2100155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab70f629a40ba8d7af005b4fd43a96d9759c5dd858aaf3aa9a7ca430af24406. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:30:58Z), 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/PT2EO2100270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97809ac24d844b111011493ecd1b83be8d174747090c8331b530123c969c595. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/PT2EO2000539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0652950bf19d74c7ccb39e9903496f733127bbe564663bacf15e6e5eaf38b6. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/PT2EO2500279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0652950bf19d74c7ccb39e9903496f733127bbe564663bacf15e6e5eaf38b6. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/PT2EO2500279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d03db6b955b4eab2bc233eab25163fc114498ac5732ea25689dc0669011e37e. 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/USA371606645.