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 0x6e93e9e144f8980d7d463426de6983d1fac2924e5fcfc52fde7905ab469ebd49. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0efe62a-ae17-4d9e-b3d0-96d535fbea51.json and https://artists.proofprofile.net/proofs/artist/a0efe62a-ae17-4d9e-b3d0-96d535fbea51.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kira Kira Piano. Piano Collection for Adults Classic Level A
Kira Kira Piano. Piano Collection for Adults Classic Level C
Kira Kira Piano. Piano Collection for Adults Classic Level B
Kira Kira Piano. Piano Collection for Adults Popular Melody Level B
Kira Kira Piano. Piano Collection for Adults Popular Melody Level C
Kira Kira Piano. Piano Collection for Adults Popular Melody Level A
Kira Kira Piano. Piano Collection for Adults Screen Music Level C
My Favorite Things (from [The Sound of Music])
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 0x413f6056f69ea41c94ea65924a51a22b1fa9a09745fa9c05526ee6f54f0494ea. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPVI02204311.
Kira Kira Piano. Piano Collection for Adults Screen Music Level A
Kira Kira Piano. Piano Collection for Adults Screen Music Level B
Le Temps des cerises (from [Porco Rosso])
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169c33868157e59be65e6fbc0ed49882a66c881cf60a04440176dd6c9c63b251. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/JPVI02204293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3216e625811df51964e0d2bbc9b7f0468dd671a32e73c95531a42722547b7d39. 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/ES8301433907.