In Greek and Roman mythology, a harpy (plural harpies, ,Of uncertain etymology; R. S. P. Beekes has suggested a Pre-Greek origin (Etymological Dictionary of Greek, Brill, 2009, p. 139). ; ) is a half-
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23caa6c1f15feb9425f6d33e54156e86dab7c04b78eb238c4a54d17dfd85628. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ecd125c7-742f-46e3-a6cb-a8d254222766.json and https://artists.proofprofile.net/proofs/artist/ecd125c7-742f-46e3-a6cb-a8d254222766.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).