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 0xe3f008aa1e6124f9f25be231ecea2dfcce9933bb75d62ec94252d915436d50f8. 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/6e0cb626-7f2d-4842-a89b-4f88b2d4d63d.json and https://artists.proofprofile.net/proofs/artist/6e0cb626-7f2d-4842-a89b-4f88b2d4d63d.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 0x9a879bf02394a092fbd6e33de6e7af46a2d7606419bdbd6aa1032139871847d6. 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/TCAFH2001579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1162dd7822fefa50fb5a16be5984c33ee69f1828ced0da9195acc82c0c7a0c56. 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/TCAFH2001580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b12e4eb960437235c334a46aa1fe1c971200f8afdd8811e7f9adc140e970bea. 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/TCAFH2001622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b7203d86eebcdcb4a378e07e53f7dbe91d6d8104165bca4a07ce49a75bcf2e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCAFH2001624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3085f7c0e9a31b527f935c521699558bc2ad34acfafd56039fc010ef053367c1. 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/TCAFH2001652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749859fb213fb949f9aefacf730e38e6026c48f81e0b1a4645ce985f095d0fec. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:56:40Z), 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/TCAFH2001659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1dae6a7426694f4a4aee5e5d45ffdf09f2a40c2243dffac0b08a6fe417d808. 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/TCAFH2001661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3523c6d7097278a07d461e709e54e8116ed8dce327a7e3559d6391050dabf1. 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/TCAFH2001667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a4e368606361dead9d47b8327eaa8945b485cf8357c472d661fffdb2b9cc81. 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/TCAFH2001685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8348fca13c08dd7a832bbf164a53205480bfac66b19d3b04f9d14fe62777180. 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/TCAFH2001689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa945ace2a521783d9fd21fb34a7a7998f844b47abbf6f6e6463c5bed9b271022. 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/TCAFH2001701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e66ad4a0e7651b118efe8e9393aad454161ebdc3f96674d22119df0dddff24. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TCAFH2032508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c41fab6fb8b63cdf46a44a27f07becbdb3c062ae4e9ad47eab19f8f9a2b8c2. 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/TCAFJ2148520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77abbadb1770b32056e7f0461354fb4f5c14b15477b55c4262edf99bf19a56ef. 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/TCAFJ2148552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1136995088fe40ad522f880ec358e73ac0a7078839ea684fa4b546a4f9da5d. 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/TCAFJ2148526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0026121d1a43634d1bc5aad3770037d8ff971dcd57dc0acb61fe90aad74f49f6. 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/TCAFJ2148528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003fd580eb28e17ce228246227917bbbcbd662136f7749fbec99108ebc21d184. 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/TCAFJ2148578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7289f0c3e25c2cc56c8f936c6b7cbb8595cd23b00243a1902a0d17fef5bdae35. 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/TCAFJ2148587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5661333c47abaa14c7221afa9c8e0d2891d7f161e8c2792002423f9ddfa68ac. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:06:13Z), 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/TCAFS2137182.