The Marsi were an Italic people of ancient Italy, whose chief centre was Marruvium, on the eastern shore of Lake Fucinus (which was drained in the time of Claudius). The area in which they lived is no
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 0xbf28acd0e1bbec61eb91fe69b0657f60a62d519122aed55b040a7653c536b989. 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/749cbee5-133b-4a8a-b4af-430142b9957a.json and https://artists.proofprofile.net/proofs/artist/749cbee5-133b-4a8a-b4af-430142b9957a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).