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 0xd2c1a3b30240df0e7a49da5e6c6ada5dd0bac14882abafcda13a2f962471c6b9. 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/bc7bc5d3-f738-492c-aac9-5f20b7aa0e4f.json and https://artists.proofprofile.net/proofs/artist/bc7bc5d3-f738-492c-aac9-5f20b7aa0e4f.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 0x29276c56a28dda60ecca3862b11dfc830937111c230f6b64f5c88cd465e0a22d. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CAGOO2548434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e950dc5b4a60a1112d0890333c75b1fcef57e0b244b7ecc54f6f1cbf9058beb. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T06:59:57Z), 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/CAGOO2548436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98356dc3bfd34a39fc951ba0f5acf134fa7f2845d78283512287006ba4a14f2f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAGOO2548440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a7a5feef6fb39c8a6f5dd8f7d019255cc6bdc8e2e0cc4ada096be318b0183d. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/CAGOO2548441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005525a4a90bd860a8bd598f9ea15bd7f43fabe4ba7828702f16935510a9ce8d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/CAGOO2548442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a043dd1c24ab1c8749a6c6c781c89fa35f97b51799f5894dd65539fb41452b0. 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/CAGOO2548443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5653f0c2e527e0ebaa379d6bf9233640eb31945a3d95be40c202d355f62d4d1c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USUYG1014072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34086886b6c7ba0465d2f394512056053fcf52530e27568df30bfbf77c36144. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USUYG1014073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166a5199c6af0303209d058ebb71524e17016a8a4e698b983a4c181a66f023d4. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USUYG1014080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2937cdca14a8e951af871bab4f06f9c1cc3362847bfe93ba403dd8d571cf3a86. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:53:54Z), 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/USUYG1312629.