Alex Mar is an American journalist, writer, and documentary filmmaker based in the Hudson Valley and New York City. Her work often centers on religion, belief systems, and subcultures. Her books inclu
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac1d69fc422c713cc7b490bf334cd332d49f85c57c7b0f61612b2918bf2bc8e. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc3d2c66-a252-4b87-9809-56b5aa92a18b.json and https://artists.proofprofile.net/proofs/artist/cc3d2c66-a252-4b87-9809-56b5aa92a18b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).