The Madcap Laughs is the debut solo album by the English singer-songwriter Syd Barrett. It was recorded after Barrett had left Pink Floyd in April 1968. The album had a lengthy recording history, with
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 0xad14281b4abc6eeac30120976afd32ef5aeb5d3767a066a6be1757f65cf2af8a. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e753dde0-268d-4b47-b287-da4d61d65814.json and https://artists.proofprofile.net/proofs/artist/e753dde0-268d-4b47-b287-da4d61d65814.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).