is a Japanese all female a cappella group. Known for their performance of the works of Bach, Chopin, Schubert and other classical composers and traditional European folk music. The group was formed b
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 0xb18249d00bce9c25eb7b36e644bc7e0d6aa09adb85aecae741398b8ed97e8190. 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/847c344a-ddb7-4230-9cb3-0aa1a7ed6ac4.json and https://artists.proofprofile.net/proofs/artist/847c344a-ddb7-4230-9cb3-0aa1a7ed6ac4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
プラチナムベスト アンサンブル・プラネタ -永遠のハーモニー