Stephen John Costello (born September 29, 1981 in Philadelphia) is an American operatic tenor and a recipient of the 2009 Richard Tucker Award.Philadelphia Inquirer (April 17, 2009) Costello has perf
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 0x9b6e416b45fa66c0b9d26ba1819381560c9e9a3b2375130979e21e8f82cb371d. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/459cfd1f-07bc-4e10-90d6-2ae30925ee21.json and https://artists.proofprofile.net/proofs/artist/459cfd1f-07bc-4e10-90d6-2ae30925ee21.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).