William John Marsh (June 24, 1880 – February 1, 1971) was an American composer, organist, choir director, and educator most notable for composing "Texas, Our Texas," the official state song for the U.
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 0x9122c9a6c050b12ce72dec107a8084a882df123c849d93436dd43512ca30d9ce. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/811fffe1-4930-4546-bc7d-de081c07c26c.json and https://artists.proofprofile.net/proofs/artist/811fffe1-4930-4546-bc7d-de081c07c26c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).