Anthony Roth Costanzo (born 8 May 1982) is an American countertenor and opera director. He began his career in musical theater at the age of 11. Costanzo is a graduate of Princeton University and of
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 0xe144a817408bae46f0d0468a2218b534efea2754b24f2c1b375ce1fe5db4d1bc. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4fbf95ff-fdfd-48f1-9ac4-59d1562ab290.json and https://artists.proofprofile.net/proofs/artist/4fbf95ff-fdfd-48f1-9ac4-59d1562ab290.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Didos (Dido’s Lament / White Flag Medley)