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 0x9d2937dc4cac8a536e804fb7c7e6e98807dab2b1a8f119cacb9db81b3153d99d. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9424b96a-2c7d-450f-b404-91f2e60c2640.json and https://artists.proofprofile.net/proofs/artist/9424b96a-2c7d-450f-b404-91f2e60c2640.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
読書用ピアノＢＧＭ: オーディオブック背景音, 読書集中音楽
カフェ読書音楽: ピアノ作業用ＢＧＭ, カフェ勉強, チルアウトミュージック
読書ＢＧＭ: 本の世界に入り込む集中クラシックピアノ音楽, 夜のＢＧＭ
読書の為のピアノ音楽: カフェのピアノＢＧＭ, 読書に集中する
読書没頭音楽：集中力途切れないインストメンタルサウンド・学習落ち着く空間ミュージック
夜の読書 - 本の世界にのめり込む癒しピアノ音楽, 想像が膨らむ曲
集中する読書音楽：リラックスして読書時間・集中力高めるインストメンタル