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 0xce1610d11701d575e77fed62de283aa5a7022891d599129e72c7f234833ad177. 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/8a5f9e45-17c9-4b41-b6c0-205173450d70.json and https://artists.proofprofile.net/proofs/artist/8a5f9e45-17c9-4b41-b6c0-205173450d70.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 0x69894868102d566a1f9de0b32962241b021df5f1312f2ee5ba6ee3431e2e6662. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DGA0P2323907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x977f942a1f792cb0fab95c17937727dd0ebb44ce8ad0f5cbaca47b9aacf3b784. 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/FRX282327081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c1bbe5fa815883c1713951f5a68ec878378e6f74b8acacd3a331a4a6bf75dc. 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/HKG732332712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bad29cd7bb82bbaeb1ab284c4b3962ba2eb0b6e68fe28fd54473ed9cb87e929. 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/FRX452328951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf40abeba283b9e60fe78cb735af1c9cb22efad0012ff293b32ef894bbeeb4a0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR59R2223828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed21fa2c7303e7ad2d6ea4d4c22156ebc64c60170328ac95003fddd758736631. 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/FR10S2240274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1992a31af71e8bad093789fe0af123d6fefca2291d7ae792bb06e4544aabf02. 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/FRX872155313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d95251a0854cf5780aee822c979c608439d7947bb1a4b67c274119c2b6b739e. 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/HKG732136892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ba53fabf2d7c70110df93bd2f1c58713f0b375674619a87963004539e4408d. 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/FRX452196371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15699f259f8e17565e8071d8c501a3f90c9573cfffa6017e4045e3dd45b9c57. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FR96X2153348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607081ca0843731970b8f22653b91d4ff366eaa3963d3a8059a8f9d91bd56842. 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/HKG732236182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a223c56502037c7660dc0b1482a763aacc43f36e3c665c1ef24d9bea700f73. 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/FR10S2168437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e82611521f9bf6ff9fecffa5e1d2dcf3b5f969f0f01ef8b5b7fe1ed5ecf279. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FR10S2168439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6d2e1038976bcd55aac0fe141efb1a215ee885feede0999a667efa4d8d969b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR2X42046128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6c922ebc6551b58625a046292bcba61334b7fbd6ce6c327cfd8798c5858f68. 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/HKG732005897.