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 0xf6605c651e5ae2ebd1bf8750594c45cce594de86c7b3f5d52a782e5d665eb0dd. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a0a461c-6570-45b6-aa0d-ae9dc20ce772.json and https://artists.proofprofile.net/proofs/artist/8a0a461c-6570-45b6-aa0d-ae9dc20ce772.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Eugene Onegin, Op. 24, Act I Scene 1: No. 1, Duet and Quartet "Slykhali l vy?"
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 0x0e97e63bb75e122f5fca7cb45173434d199474b0e3923ebe57f5a354ac3026e1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UK2Y21309064.
Eugene Onegin, Op. 24, Act I Scene 1: No. 7, Final Scene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc9c0949e85ab0b17308c500f28aca73644d7ba76ed82633b9c816ba7f91893. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UK2Y21309075.
Eugene Onegin, Op. 24, Act I Scene 2: No. 8, Introduction and Scene with Nanny
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d40f8c4509767b849098cdeb9196605d46c916f57794cdfc694d4e38c5c354. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/UK2Y21801575.
Eugene Onegin, Op. 24, Act I Scene 2: No. 10, Scene and Duet "Ah, noch minula, vse prosnulis"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3a825eac2a731c59c99ff2c98653b14504ac3a134f695ae5b5dbbb8f2ef7f7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UK2Y21801577.