1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0x570b9f12e4005d139ca444aaaf13ee2bce6204f24097d8a4c1081d7a99a94109. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a1400a3-5b97-48c1-8eec-3c8ce638a7ea.json and https://artists.proofprofile.net/proofs/artist/2a1400a3-5b97-48c1-8eec-3c8ce638a7ea.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Lincoln Album: Readings by Carl Sandburg
The "House Divided" And Cooper Union Speeches
The First Inaugural Speech of March 4, 1861
The President's Message to Congress, December 1, 1862
The Poetry of Carl Sandburg Read by the Author (Mono Version)
Psalm of Those Who Go off Before Daylight
Carl Sandburg Sings His American Songbag
He Came from His Palace Grand / Bonny Eloise
There's Many a Man Killed on the Railroad
When the Curtains of Night Are Pulled Back
The Great Carl Sandburg: Songs of America
Carl Sandburg Sings Americana - From The Archives (Digitally Remastered)
Ballad of the North Carolina Mountain People
Psalm Of Those Who Go Off Before Daylight