Cathie Wood's ARK Invest and 21Shares have announced the integration of Chainlink's proof of reserves for their spot Bitcoin ETF, aiming to bring reserve data onto the Avalanche (AVAX) mainnet, as reported by @CoinDesk. This development marks a significant step in providing transparency and security for the $ARKB spot Bitcoin ETF. The integration allows for on-chain verification of the ETF's reserves, a move that has been positively received within the cryptocurrency community, with reactions including 'BULLISH $LINK'.