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 0x5eee48a2c0c4e834250a91dfcc1d72c75a70389e7c31b4d84b51e203553b6ab7. 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/643f517d-b26a-483e-a2d0-b2f0a6c377a0.json and https://artists.proofprofile.net/proofs/artist/643f517d-b26a-483e-a2d0-b2f0a6c377a0.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 0x36063a022a308527fdca6c500a30a853ae8d2a873c3d3347eda57394ec8ced93. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:22:59Z), 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/QZNWT2232923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1776ec30189f320eaf07e8c87811cff0c3427d3653dd62e246d50147e1d1ef0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ32380506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3917df1dac1c9d54b4ee626c07d459df726bfa87bfe7f1a8842a62caa3f28d. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T16:06:53Z), 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/QZDA52377868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaab2d61f8acd57811ecb253fd425996be94d10da4f0b3296eb56796a9174934. 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/QZHN52317747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7142d77dccf9c035bfbee21dcbd1e5318579b85ab30190bde0ed41d0f77601. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB72313794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b60007213e21b1009b13de9f1e4beac6f4eea71c54b385a78ba5d6bd9206099. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZNWQ2476102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae6e24936788c32e07ff0e885d4b94aa84ce03d46fc96bfc72398593e772394. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTB22456125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ebc7a2dd8f8f2475d89a6960dff88fc145f3dba77ad6d5b2b7116e1392aed6. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T16:03:33Z), 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/QZTB22456126.