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 0x29304909748f101d1b140c38826918530bdff0c2d61abedce8d1c08868d6941a. 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/89b23a53-2cb5-4def-84a3-38e5fd2ef784.json and https://artists.proofprofile.net/proofs/artist/89b23a53-2cb5-4def-84a3-38e5fd2ef784.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vacation Days - From French Baroque to Sevrac and Tailleferre
J.S. Bach & S.L. Weiss: Transcriptions for keyboard of lute works
Russian Piano Music for Children, Vol. 2
Russian Piano Music for Children Vol. 1(Tchaikovsky: Album for the Young, Op. 39/Prokofiev: Music for Children, Op. 65/Shostakovich: 7 Dolls' Dances)
Russian Piano Music for Children, Vol. 1
Hello! From the Northlands: Piano Pieces for Children from the North
Serse, HWV 40: Ombra mai fu "Largo" (Arr. for Piano by Genta Takaku)
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 0x602ff46fcdf3d2d266398a19b19c616ca33528b49ae7ef7e41fe0cd9f771d47a. 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/JPP592354171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d9e9eac849d45e13c9449ddcba10e014e0aa80720da131ec08a594825afa50. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/JPP592354126.
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
Hiroshi Hara & Kazuko Hara: A Selection of Piano & Guitar Pieces