CapZ, also known as CAPZ, CAZ1, CAPPA1 and beta-actinin, is a capping protein that caps the barbed end of actin filaments in muscle cells. Structure CapZ is a heterodimeric molecule, made up of an
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 0x90b2269ae2f68ee2e496a2f90e720a994c0ddc5db9c19c06d061f52b7d6521c8. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf880ac1-07ef-4cf8-8fe3-b923bc2a7deb.json and https://artists.proofprofile.net/proofs/artist/bf880ac1-07ef-4cf8-8fe3-b923bc2a7deb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).