Technology Development 1. alt-sdk: added length check for ristretto encodings, added type check for sigma proofs, fixup client docs in sdk, use constant time equality check for elgamal and aes key derivation. 2. Handled VoteStateUpdates for outdated roots bigger than slots in existing VoteState, set root to the latest vote in the tower proposed vote state). 3. Updated BigTable apis to respect a limit of zero, parse address-lookup-table instructions