Aak (; ) is a genre of Korean court music. It is an imported form of the Chinese court music yayue, and means "elegant music". Aak was performed almost exclusively in state sacrificial rites, and in t
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 0x9b27a3dff261996b162be874242dc33a2c5213fb13ea9e323cde3248f24b9a77. Chain 2 (Bitcoin): anchored in block 954008 (2026-06-16T21:31:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/332eeb7b-b2db-420a-9fba-d8501414ab6c.json and https://artists.proofprofile.net/proofs/artist/332eeb7b-b2db-420a-9fba-d8501414ab6c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.