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 0x1a74e623f3e7b1feb6fe8259603a9c4c6261b5d88bdab9419a160cd3fc47a904. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/51d6e06a-27c1-44bb-a706-ed3b9721c547.json and https://artists.proofprofile.net/proofs/artist/51d6e06a-27c1-44bb-a706-ed3b9721c547.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 0x6aa3f53915f232abbb9fc1ab14400a569fcd361976d8ee611d39198ab7ae9c9f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/SEVVF1100701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61302fdb7e0037fb014344bb615b3364012cddbe847f83d9de77903237ac5fe5. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/SEVVF1100702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3966d9d98edd433c1e72c6ab93653edc14c6150f257708085c4990f057b40d70. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/SEVVF1100704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ceae49e5629bc98fb1d3404e0832b112b35538070aabd5ebd724f20a5012d69. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/SEVVF1100705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c1ebe5b3b0799d6a2605aae54c1205aa3df8216d4034f2db13c871e97ae1a7. 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/SEVVF1001902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cf586751f5e2cf2e63e034bd0f2723213c24f087f2291f79aa053115d97cc2. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/SEVVF1001903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4a64c6b32babd737b383fee07e647de1af1ca71d78203be8ba0e1eed8eace2. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/SEVVF1001904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7580575956f86a8639a502a555ac2d468e15cd1b8315f68795969aa06373305. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/SEVVF1001905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9920ec5b3c4b0be5803be548ad9308aed870f531e89014d95774f74efd8e8a4b. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/SEVVF1001907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ce473daf529c9eaff0a3300f7d639e82880e844b8e566aa6fb667870709cb7. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/SEVVF1001912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5981ce696416b66e34ebf42730bec2e269baf52f230237a7e1a0cec31f69ad9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USCGH1056932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2ea7801a6abfa69d1eee1fc31d22abaf6c0c576e81db6bd52c1adcbe5458d2. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USCGH1056937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2b022e4204d9b501a8e21705cd7db279fcebac8331ef630bc1f5f9c9b80990. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USCGH1056938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63031dd168712563cc1e82f7c8293ad84a159395cdc3d119f09d85b20f74ecfd. 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/USCGH1056929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58937be0d8db25217b9ef683b3f08a5fecb524baeadb37cadb5d9cd8ade9765f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USCGH1056915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b36a03d9b824e6953ffe2f29c80b3004c5ca2a806430965c7dc223cae33c28. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USCGH1056918.