Welcome to The Protocol, CoinDesk's weekly wrap of the most important stories in cryptocurrency tech development. I’m Margaux Nijkerk, a reporter at CoinDesk.

In this issue: • BTCFi’s Big Problem: 77% of Bitcoin Holders Haven’t Even Tried It, Says Survey • Ethereum’s Fusaka Upgrade Passes Holesky Test, Moves Closer To Mainnet • DoubleZero Mainnet Goes Live With 22% of Staked SOL on Board • Bee Maps Raises $32M to Scale Solana-Powered Decentralized Mapping Network

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BITCOIN HOLDERS HESITANT TO EXPLORE BTC DEFI : Bitcoin decentralized finance (DeFi), also known as BTCFi, has been touted as the next wave of innovation for the world’s largest cryptocurrency. However, research suggests bitcoin holders themselves are barely engaging. Some 77% of bitcoin holders have never t

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