[FIP - 309] Add TricryptoFRAX to FXS Gauge Controller

Summary:

Curve LP token: 0x4d1941a887ec788f059b3bfcc8ee1e97b968825b Convex pool ID: 255 URL: https://www.convexfinance.com/stake/ethereum/255 Documentation: https://docs.threshold.network

Background:

The TricryptoFRAX pool is a modern take on Curve’s tricrypto pool, and contains FRAX, tBTC, and frxETH. This proposal aims to add a gauge for Convex wrapped positions of the TricryptoFRAX pool.

tBTC is a decentralized wrapped Bitcoin, backed 1:1 by mainnet BTC, and maintained by Threshold DAO. Unlike other wrapped Bitcoins, the BTC that backs tBTC is not held by a central intermediary, but is instead held by a network of nodes using threshold cryptography. tBTC is permissionlessly redeemable for mainnet BTC.

Motivation:

The TricryptoFRAX pool is a permissionless and decentralized way for Frax users to move BTC in and out of DeFi. Threshold DAO aims to build a relationship with the value-aligned Frax community, to offer decentralized BTC DeFi usecases.

Voting:

For: Add the Convex wrapped TricryptoFRAX pool to the FXS gauge controller Against: Do nothing