24K may refer to: 24 karats, as in 24-karat gold 24K, an unreleased album by Cuban Link 24k, a 1983 album by Band of Joy 24K, a 2016 album by Evelina 24K+ (band), a Korean K-pop boy band, former
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 0x39aa553e835268897608d0098a01991dba705d980f3c6322fd109b2ff0d94e69. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca5a8b50-1894-4990-835d-cb5786477ddc.json and https://artists.proofprofile.net/proofs/artist/ca5a8b50-1894-4990-835d-cb5786477ddc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).