thumb| center|200px|alt= Palmgren's signature Selim Gustaf Adolf Palmgren (16 February 1878 – 13 December 1951Selim Palmgren. Database entry. MusicSack. Retrieved on 2011-01-26.) was a Finnish compos
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 0x81e4b27b53c9cd398e6bd7d9c38183a0264ca76418fc1525c9193fd589bb47a5. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/78d14378-8824-4bef-ad5b-a841a994bc92.json and https://artists.proofprofile.net/proofs/artist/78d14378-8824-4bef-ad5b-a841a994bc92.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Palmgren : Early and Middle-Period Piano Pieces
Palmgren : Snowflakes [Lumihiutaleita] Op.57 No.2
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 0xfe18ca893dec9de8f7cc0770961e8e674868077d1de4578755d65a03734caa2f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FIFIN9500235.
7 Piano Pieces, Op. 27 "Spring": IV. Kevatyo (May Night)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf703ea5bb209904cc1da49f5d854311245068ccd18551a06c4f74a7300c92a01. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKI199951408.
3 Piano Pieces, Op. 54: I. Vesipisaroita (Raindrops)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a042c9bd8c0478132fd9fd6ad873f439ec7da5868ce641bad10b05777e75b3b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI199951416.