Artmo.com is an online social media platform based in Hamburg, Germany. It works as a platform to promote art and connect those who are interested in selling, buying, or merely discussing art. The web
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 0xe3354bf6f4ad60fb0f9473a682dca75135e5c89a1982a592c89cdc0be512ae10. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f06c46d-e17f-4c9e-b4a5-3e36a2625f9a.json and https://artists.proofprofile.net/proofs/artist/5f06c46d-e17f-4c9e-b4a5-3e36a2625f9a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).