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 0x233b0f8a85b19367095fbede4e499899a866fb8bb335d1c85e908481141ea7a5. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a1aebc64-6f52-4604-9ea4-3a778f8f9187.json and https://artists.proofprofile.net/proofs/artist/a1aebc64-6f52-4604-9ea4-3a778f8f9187.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 0xdff8b1bac5d01a32462acae42b6110ddd434861cdfd900627f18283fc2db74d6. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/TCAJG2538680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a28db3940c54f06ca6a76409716cc747d8f58af72cbfe65aed30e005daf825a. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TCAJG2538706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2cf5fb0b7dc9104f848491c283d997ca67ffc961bf6cc9c95c09507c67d781f. 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/TCAJG2538723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1368a5796add0157d66b62553cb0748230b10cdb84b09d9656788a762038d0d5. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/TCAJG2538739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f1c5f425fd85b44458375bca5e56ffb6d869707563d46d6e157d7fd1ee637f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAJG2538776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d70b87fe29e042345e83901bd19adfbb7362def299ad2a52b336db18eca4be5. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/TCAJS2544449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aeeb0bd14e29c6348cfac2d7af8637568489736d7cf425cb4beebf34b4e6e14. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TCAJS2544463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455b4dc7551f484249768cb5773e94b9186b7f21ef5d0dc9ceb871e29bdbf9d7. 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/TCAJT2544476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9698f324a0fe1fe4d6641f6c29a6bf4f3ec4cabd181bf93e574c1c927f4d3d3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAJS2544489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b548b28d5d3bef36a54b67dfe332385a3f3260009c9fc6ed8cebad98956042. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAJT2544499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b9dbac7102a7e50cb1ad1836a5f96343bdbbbe9c94da42bc136afb0a249ee1. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCAJT2544503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0d13b39c14e529c36ae042fefa22e23ab46e0c66244e0c06aecdc6383d5f94. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAJS2544510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b286370dd5beab8f9d53ca12e4012e9713cbac73da8013acbeeac7fe460b54. 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/TCAJS2544517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1519e2c6e395b8afb055dbbc132c5e7112b20c7f61ab45c24fa9340501618182. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/TCAJS2544538.