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 0x709ff8a3022fa42dc009c0e7c0a8221e2216868a116ebe787e6ffd1241a5b649. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aba1258b-9514-4a08-81af-de35224bde04.json and https://artists.proofprofile.net/proofs/artist/aba1258b-9514-4a08-81af-de35224bde04.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
J.S.バッハ:主よ人の望みの喜びよ～アレシュ・バールタ/オルガン・リサイタル
ドヴォルザーク：交響曲 第 8番 ＜オルガン･ソロ版＞
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 0xefd9c697b11bebebb39a5e45feba35b367ea37b69d4d1c9cada80fb2d84d0c04. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QMQL91200111.
A. Vivaldi Concerto in A Minor II. Adagio BWV 593
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed059d5c581ab19620b0477518ac8f436bf7445516612c655fa659566a52d56b. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QMQL91200115.
Dvorak: Symphony No.7<Organ Solo ver.> - Brahms: Prelude and Fugue
Dvořák: Symphony No.7 <Organ Solo ver.> - Brahms: Prelude and Fugue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f488f86ac09d6b0f68856541624a2982ae9a08fca1275baf29b0818cc84bdb. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/USB8U1045844.