Matthew Erickson (born July 30, 1975) is an American former professional baseball infielder who currently serves as the third base coach for the Milwaukee Brewers of Major League Baseball (MLB). From
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 0x9b507328dbadc53475dfc34cb1bf5388d0a6d6cbd3cbe0963996098998a119de. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f39ec9d-3a8c-4be5-93d8-a173fec0549c.json and https://artists.proofprofile.net/proofs/artist/0f39ec9d-3a8c-4be5-93d8-a173fec0549c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).