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 0xfb449032f8331b162397aa49588b9f23c3c06d4a7f7f496437aad50ea1b230f0. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b58e797c-52f7-4e9c-bece-ef62c1b3729e.json and https://artists.proofprofile.net/proofs/artist/b58e797c-52f7-4e9c-bece-ef62c1b3729e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).