Sigurd Slåttebrekk (born 6 January 1968) is a Norwegian classical pianist and professor of piano at the Norwegian Academy of Music. In addition to his musical career, he has worked extensively as a pr
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 0xe02a22e005253ffa4afbd954fa64db229f8807deb1e13d3ad6a39fff89e676be. 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/816262e7-ad00-489d-9841-586782bf3c51.json and https://artists.proofprofile.net/proofs/artist/816262e7-ad00-489d-9841-586782bf3c51.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto For Piano And Orchestra, Op. 16: I. Allegro Molto Moderato
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 0xdffc772c6e4c38598a4d490daf0d20df2963a16212dc22069de4a3a0fc5d88b3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOFZS0560160.
Concerto For Piano And Orchestra, Op. 16: Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbe91f316a83c2fcc87084ba77b3a0573de8864c2c825a05de5a7c2f2369203. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NOFZS0560170.
Robert Schumann Carnaval - Kreisleriana - Arabeske
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee4c84bad7006e3c094eb4b9bcf5bb079d95b74951ad5e1e2d391bd1bfd9278. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NOFZS0315050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11168f7192dfe8742c1a1a81def67cceb997597e97915e048958436e9e196e64. 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/NOFZS0315120.
The Queen Sonja International Music Competition 1992, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ef302537acf56a61a234d8ed769759b52446d14bdbaa6025e138b9a8f60e9f. 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/NOFZP9224140.
The Queen Sonja International Music Competition 1992, Vol.2