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 0x225b79073858f4c2cb2818c40a222713300fbaef922e33e8a170bc423291fc81. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0d562b5-9593-4f22-9ca8-a7fb3600d73a.json and https://artists.proofprofile.net/proofs/artist/b0d562b5-9593-4f22-9ca8-a7fb3600d73a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Nocturne in E Flat Major Op. 9 No. 2 - From the Film ''The Eddy Duchin Story''
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 0x6453815d14743d70a77a2be8083ac42af06eaf395742ab78aeedf87add8a62ac. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/GBLPF0277497.
You're My Everything - From the Film ''The Eddy Duchin Story''
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c7c63d6866846416b5231ebe8f3405973b325add4a2985a8765c6673b2ff87. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/GBLPF0277499.
Brazil - From the Film ''The Eddy Duchin Story''
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bce78f5a6a4a5f6bb00a0641b95c5a983df24dc8b90a17832eb5e7f8c530deb. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/GBLPF0277502.
Manhattan - From the Film ''The Eddy Duchin Story''
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26f58977ea8f16e72b254ce5500d783bdf13b1e3299434e8dd827a1fe0ab58c. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GBLPF0277503.
I'll Take Romance - From the Film ''The Eddy Duchin Story''
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f957dc79725e6994772e412090bcbb84ac473a40a7803a981869f5bf5d7d4c. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBLPF0277505.