Tartu ülikooli kammerkoor / University of Tartu Chamber Choir
{"copyright_id":"0xace16f85daac7e99e3b0cabcbe62982319878638c47689c17edb30af49b729a4","name":"Tartu ülikooli kammerkoor / University of Tartu Chamber Choir","registered_at":"2026-06-21T04:30:55Z","symbol":"NIM1820564","token_address":"0x6c9aea3072b660f32154a6290208e7380786d597","type":"artist","uuid":"dad50103-d5ad-4c87-bf9d-2550334ffecf"}
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace16f85daac7e99e3b0cabcbe62982319878638c47689c17edb30af49b729a4. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dad50103-d5ad-4c87-bf9d-2550334ffecf.json and https://artists.proofprofile.net/proofs/artist/dad50103-d5ad-4c87-bf9d-2550334ffecf.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59b54d2d4d0fda79b88b3b8a56b4c776239ed75d7181fb19a3cda76c1ee6819. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/EEPJ32100025.