Choir of the Center of Culture in Krakow Directed by Elżbieta Ptak
{"copyright_id":"0x839d32d430686755ff1db4d6be915d2e4e71cfeabe02ccc88a8eefdabe703d01","name":"Choir of the Center of Culture in Krakow Directed by Elżbieta Ptak","registered_at":"2026-06-16T01:42:55Z","symbol":"NIM0897952","token_address":"0xfab97ac7f7248148d14a3da3a453a64df095f39e","type":"artist","uuid":"22fdb733-53ba-4cf1-ae3a-c89ebf10df87"}
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 0x839d32d430686755ff1db4d6be915d2e4e71cfeabe02ccc88a8eefdabe703d01. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22fdb733-53ba-4cf1-ae3a-c89ebf10df87.json and https://artists.proofprofile.net/proofs/artist/22fdb733-53ba-4cf1-ae3a-c89ebf10df87.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 0x15ac80f0b3fa67cbc1666c693f94185bb8689b9a377272dc7742f68f15d9d02b. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/PLJ051302243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd342cbdb917962475ba4d6460b04b16780c1622e003ec67888b2369dbb44d248. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/PLJ051302247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89acab801f0ac722f6e2ea3f5a4c29e415702febb3abdd4a62d8b8fb689fb3c4. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/PLJ051302249.