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 0x1d0f225f58e6b1b4f327e47f5508e4396bd50fe3ffb64c55219a3fb12b0519b6. 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/1cd42dd6-a810-444e-a1d6-212afeb2b5ab.json and https://artists.proofprofile.net/proofs/artist/1cd42dd6-a810-444e-a1d6-212afeb2b5ab.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 0x72e7872d619e9796a04580899794b9e840a849a7d094c553d53f112a1240d191. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/TCACY1730957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fc9ee44de2b3f893c3c9720b4eafa531c35e6511ae8f794d8bcf08f6642011. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCACY1731120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02508cb4319294c203c626d7e01801f50b21f005531f7d9ad6c58fcfaf92a9c3. 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/FRX281738591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf771414726a4838b6f56374218542f2863fbab4f6e5565ab7f386313a442a99c. 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/FR10S1824870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffdd3930154c5199eb586af6501ac98ebba4de04dc0a31bb67db9e81ab1e40e3. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:04:18Z), 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/QM4DW1820135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe773bdb1c9016af86d1c62a395ee959b375507f8e8f447ca1baf617f47e066b4. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FR2X41878706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234e6f138ed5835ec2f90dfc11021ea8046823b9bcb67de6b4bb83657665493f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FR96X1802512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8971295e16a268d223c64e6ddd4395aebbc77276c5221c7d64ee2b6118aa3b25. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FR96X1805815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe773bdb1c9016af86d1c62a395ee959b375507f8e8f447ca1baf617f47e066b4. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/FR2X41878706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561fe399b0c0ac75180052bc8d1d4f604cd4e0d636dee0e93bc5a2776f09e315. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAEP1916181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bb67dba84ec5906763161032d557ce773c7944b8f298a1789154c53e5ea628. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZD442000588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de05a7cd0b6d9c1b55721789d3d41f2f7a98d6fcf57ebd729f84927347b84af. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/DEVF12000614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5943649521531c484445faa8512e3e6837a28aa5765a46aa6ad03fd99c6920fc. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/QZ8GX1701045.