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 0x0a5ec302e087696ad5ff06d4a432a3ef5eeb048bc0434841575cc82c387b02eb. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a62ccb64-330a-4f5b-a862-66e5d07a556d.json and https://artists.proofprofile.net/proofs/artist/a62ccb64-330a-4f5b-a862-66e5d07a556d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
神秘の洞窟: 良い睡眠を取るための癒しヒーリングミュージック
洞窟の水音: 神秘的なヒーリング, 睡眠用ＢＧＭ, 水の中の音, 湧き水
洞窟の癒し音 - 水中の音, 神秘の自然, ヒーリング睡眠環境音
自然の洞窟：水音ヒーリングアンビエントミュージック・心を清める神秘的癒し安眠サウンド