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 0x78f72879e5615071a82001696c5a4a4c1d9e87a8d221eed987ea95feb071c666. 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/ff390f62-a54c-4c21-bf5a-3d4d7fe5b13f.json and https://artists.proofprofile.net/proofs/artist/ff390f62-a54c-4c21-bf5a-3d4d7fe5b13f.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 0xa44e259b917f446ff2221e1e09efc4467b495ee30cd52e6430d988a0a8207d9f. 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/TCADA1724746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c83021592049a5647e873d33ba612bd4138c9eee63914ad926881b7f94f5e3. 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/TCADM1810139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3b3e60de906a7355549faf913958c19e88c823acc9adcbf1ba8c20116a42a6. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCADO1812130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc5eb0f39fff8fe6a329b3703a987b2abc3e78b7f9bbe88e816feefc8fca1cc. 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/TCAEM1959458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c440c1062db3c996e5bfb620461f8c4bfd6f13d6803b2cc9ce8f47a79d4ac6. 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/TCAEN1928581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb5678539a9299512787bd8e7ef5e02d5b1d263c6d869767c328b6fb755b5be. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/TCAFA2074746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd431d1950e8bc1580c3577bba64ee749fc9fb46c6ce70e810624cbb3e83e5cc0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAFB2044086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45dbdded8019b39258ed6d5e31cf9467d29520062bfd65a6e6f017087b83b5b. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/TCAFB2078719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4a5f397bebe24d46066c049b81fb5cc4a76e55f286b2dfbbb467a6b4ff7ed6. 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/GBLFP2045686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc7f8fa02ee01eb0b9b05915274225eb44d08ff8d23086812fb495d6c183a25. 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/FRX282157444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x977f262cd57302c86c22934b8077b6a9ee134f19f49c0e71813d649a70b1bf73. 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/FR59R2272237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4faeab030ebd464d45a155f3db31208a9ceefec3df2dfe1f82df424b6af815f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CA5KR2362359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ece7d79c9c7ea07d49b2da0ad92ae68c60ec9e6652248ae9d4a4eccac6f8ce5. 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/TCAHR2329352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6de82e3ccd842e7d435d2823377fb9d9a392f3f8cab39db9079e50193292f3b. 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/QZFZ72492131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbe717e376cf074b1f32c0116f0f094388cbdcab1d29ecf32a801099583a1ce. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZDA42584652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844f7ac5777dca154f79f79c04db22a62e48579c65ec9bb08c91e4123cc81bda. 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/QZWFR2570048.