Sierra Aylina McClain (born March 16, 1994) is an American actress and singer. As an actress, she was first recognized for her role as Sierra in Daddy's Little Girls (2007). She had her breakthrough a
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 0xe46ce543ba029a53d1d229abdac4f05440e3cd4e22d06e082d0dede8c7d2c39e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e49cbc94-9274-4bb4-8bc3-a9388b1598c5.json and https://artists.proofprofile.net/proofs/artist/e49cbc94-9274-4bb4-8bc3-a9388b1598c5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).