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 0x954034eef22196674eafed592ee37bc6ce0442403aad172001f268f02ceb05a6. 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/6b4e86ca-08a2-411b-9cda-be95bb0f8eee.json and https://artists.proofprofile.net/proofs/artist/6b4e86ca-08a2-411b-9cda-be95bb0f8eee.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 0xb374206253ce2ae3a660587bd4c074158ce0b8d116772c3a01ab10a912eb1c2d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLB150300350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c08992cba3a3a207df219891565c5fc644562d0f1a84ee28f471605f73cbec1. 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/NLB150300353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eff030654d86f73d66d28e4134efdf95a83be9c3415117347ca839e7a3827fc. 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/NLB150300357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a2affee16dc4c016daceffe215e5017f736c39a94525f0f8d210b4c4fc883c. 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/QMPK41800075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb16e0e70d16ca09d95e714bc2bbf144ef1ce1bac346cf16e182e658910332c. 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/QMPK41800079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968126c2bc006f49b6b16bea43fe819ab8d3ff8712d3a5a7f1baca5f088f3cda. 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/FRZ131470010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e1e1d00b86ca0ea4c1031b4a752ca1ebee86e4833b273ed258681245c5aa0e. 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/FRZ131470020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3351df32382e6f392a26828a666591f52b08e97e1f12f771e80d21ace777902b. 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/FRZ131470030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050e3ea90c575cf8817a01622ce4856ed71d85b3be24035cf2f8ec66eac9d8f7. 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/FRZ131470040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56924c1df39ea8ac34efb39745c08532b39b231ba359623714a0a8c13207533d. 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/FRZ131470050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58b3b0cb36bfda22709dfedd0d830a79110887da30b2ee18c2f812c9552bde2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FRZ131470060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd16691017bc398d8cf86cf89c2ad8f070a76a5c45ee117bd3f5e1bf59eb40b. 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/FRZ131470070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0461e960061187d2b00b81b92142ca47569e1ade1f5df889223d2d5935bf540. 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/FRZ131470080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884344a49f88dd0d88d16fa2f1e4972d908f68e187c6f8c36c2dbebb187b49ec. 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/FRZ131470090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e51c176ad6a1933edbeb19b8ed65519121f4360bb8f4dfeba5cca87152f88bd. 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/FRZ131470100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0200b80293e92f0fc8d94ff28b61fdebb2834d5a481c1265f6fa3216b32395. 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/FRZ131470110.