Grant Henry (born April 3, 1979), better known by his stage name Stemage, is an American guitarist and composer. He is known for his video game and television soundtracks, including Cartoon Network's
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 0x8687c763f930b197c61a822dd2c3907ec2f6773c2638687e769e4e7b95c33ca3. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a000cb25-d4bf-471f-8ca2-3a93f23b9075.json and https://artists.proofprofile.net/proofs/artist/a000cb25-d4bf-471f-8ca2-3a93f23b9075.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).