Thomas William Roberts (8 March 185614 September 1931) was an English-born Australian artist and a key member of the Heidelberg School art movement, also known as Australian impressionism. After st
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 0x3ab76b6dfb73d5425495c86dea998b3d150070803c7489d8b3d78596f8bba1dd. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/77c6412b-f4bd-46ac-84f6-5580bdf22f20.json and https://artists.proofprofile.net/proofs/artist/77c6412b-f4bd-46ac-84f6-5580bdf22f20.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
On The Spot Audio Guides / The Mosques of Istanbul, Vol.1
On The Spot Audio Guides / The Mosques of Istanbul, Vol.2