thumb|Antti Aleksi Siirala Antti Aleksi Siirala (born 16 May 1979 in Helsinki) is a Finnish pianist. Career Antti Siirala's international career was launched when he won First Prize in the 10th Vien
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 0x6f8717e0bf347e8dc038194907387df766cca95d15fe08e72e69e3a035cfbaf5. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02c30ffa-d5ab-43e0-a74d-37626b49f7c8.json and https://artists.proofprofile.net/proofs/artist/02c30ffa-d5ab-43e0-a74d-37626b49f7c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Die Forelle, D. 550 (Arr. for Cello, Piano and Contrabass)
Ich mag keine Klassik, aber das gefällt mir! - Für Kinder
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 0xf39cd07bfd3ed157cc2e479075618e959a75d0cc53c1b1b02d1c10d4fb69b7e4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEE861100890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39cd07bfd3ed157cc2e479075618e959a75d0cc53c1b1b02d1c10d4fb69b7e4. 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/DEE861100890.
Ich mag keine Klassik, aber das gefällt mir, Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39cd07bfd3ed157cc2e479075618e959a75d0cc53c1b1b02d1c10d4fb69b7e4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEE861100890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39cd07bfd3ed157cc2e479075618e959a75d0cc53c1b1b02d1c10d4fb69b7e4. 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/DEE861100890.