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 0x8223db402399e9836c1dde7034a09c0d860ee057896b5dd2959f1c65ffad691a. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/975d5359-861e-460c-803d-8fc9c3dea726.json and https://artists.proofprofile.net/proofs/artist/975d5359-861e-460c-803d-8fc9c3dea726.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 0x65b993636a35f897d285f2e51174e2bb21e9afc15aaab6a251a99e538f71cef0. 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/DGA0S2458439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ec45ffde12e1cd6cf43f0cb69ed9797cd89120e6092c805d88156e5010794a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DGA0S2458440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4424660cfd1ecafce54cf12d7625ac0774e931ac291622f598d79342324e833. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DGA0S2458441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f3f784971dad189240678bba66c011352afa26e122fb6af5622cefcb9548fc. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DGA0S2458442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b8683cbc5bc45dd92bb1a8c5b5678c7786acea3b5cdc91bc5c12b89882250d. 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/DGA0S2458443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9795941109d692e929301047514e05455dede4a26a23617d2463b6c2c4ce57c. 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/DGA0S2458444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acc7c07868e9a84e72d473bcc15a610c1b4894c8ff1bff744408c11ebbf2c0d. 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/DGA0S2458445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d37e6597c885582e3faa165b116b771897a77cae688673893b3d4c8cd6bd49. 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/DGA0S2458446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34f0da1a012bbcf893649764fc9175a7ed9eadfd74244d05d74f046759e609c. 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/DGA0S2458447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0065429a5b5522d79219b7ee4de4a3dbd2fef960cdf1c1e59e45eab2e751c4d. 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/DGA0S2458448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf8c02bb9dff7df47cea4f379b75286ede6ed6128de4031a6ffaf4161bf56aa. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DGA0S2458449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfdc3fac336117865acfaafd44b1323caaffe310be6417e0a2cfc8d8a010fb90. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DGA0S2458450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ef3ed76eef1892a3bb010d381d9087b82a4edcd26db56590078fc1e46ebcb5. 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/DGA0S2458451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb21fe67cdbeb3f9ee620c8a12637573e208eeea427cf0b52a0928b1cfa50441. 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/DGA0S2458452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a7a3eee31b301b2252e0d115965c2c71f8dcf25d96ed85c529e433e6eb2433. 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/DGA0S2458453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb837df7663f953145177fd03fd36031c0d8e9d7e1ebfae3fd2ecedd32e862b. 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/DGA0S2458454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ee24d3dc914ceff5e47dd786073b6212e096efd6a1962976734c56bad98ef9. 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/DGA0S2458455.