John Heard may refer to: John Heard (actor) (1946–2017), American actor John Heard (basketball) (born 1939), Australian Olympic basketball player John Heard (musician) (1938–2021), jazz bassist J
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 0x0962f15d8dde6f70ff8d33ef8fd7e5dc03df712fff5bfb87421ab45468f9bc81. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc45a014-544b-49ff-a6a1-b141d6e8f131.json and https://artists.proofprofile.net/proofs/artist/cc45a014-544b-49ff-a6a1-b141d6e8f131.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
John Heard Performs Bassoon Concertos by Danzi and Vanhal