Crypto News: Bitcoin Climbs to $81,490 as Altcoins Rally and Risk Appetite Returns; ADA and TON Lead Derivatives Activity

Key Takeaways Bitcoin has climbed to $81,490 on Tuesday, extending its breakout above $80,000 as US equity futures rise with Nasdaq 100 futures up 0.5% and S&P 500 futures up 0.3%Cardano (ADA) futures open interest surged 18% to a record 2.17 billion tokens, with one of the highest CVD readings among major tokens and funding rates at a non-extreme 9% annualizedTON open interest jumped 40% to a record 200.2 million tokens with the strongest CVD among the top 30 cryptocurrencies, though slightly negative funding rates suggest spot buying combined with futures hedging rather than outright speculationBitcoin's 30-day implied volatility index BVIV jumped 5% on Monday -- the sharpest single-day increase since mid-March -- moving back above 40% from multi-month lowsThe CoinDesk DeFi Select Index is the best-performing benchmark on Tuesday, up 2.7%, with Ethena (ENA) and ONDO surging 6.8% and 3.7% respectivelyCoinMarketCap's Altcoin Season indicator has ticked up to 41/100, signaling neutral but warming sector sentiment following a multi-month downtrend Bitcoin has extended its breakout to $81,490 on Tuesday -- its highest level since late January -- as improving risk sentiment filters through both crypto and traditional markets, with investors rotating from crypto majors into more speculative altcoin plays and derivatives activity picking up across several tokens following a volatile Monday session shaped by Iran missile reports and the subsequent US denial. US equity futures are lending support, with Nasdaq 100 futures up 0.5% and S&P 500 futures adding 0.3% in pre-market trading as investors buy the dip following Monday's Strait of Hormuz-related jitters. Precious metals gold and silver also ticked higher but remain significantly below their early March speculative peaks. ADA Futures Hit Record Open Interest Cardano's ADA is showing one of the most notable derivatives setups of the session. Futures open interest has surged more than 18% to 2.17 billion tokens, surpassing the previous record set in January. Despite the scale of the buildup, positioning does not appear excessively overheated -- perpetual funding rates are running at an annualized 9%, signaling bullish sentiment without extreme leverage. ADA is also posting one of the highest cumulative volume delta readings among major tokens, indicating that buyers are driving price action through aggressive market orders rather than passive limit orders. TON Records 40% OI Surge on Telegram Announcement TON is the session's top-performing altcoin in the CoinDesk 100, rallying 8.1% since midnight UTC and 28% over the past 24 hours following Pavel Durov's announcement that Telegram will replace the TON Foundation as the driving force behind the network. Futures open interest has jumped 40% to a record 200.2 million tokens, with TON showing the strongest CVD among the top 30 cryptocurrencies. The funding rate picture is unusual -- rates remain slightly negative despite aggressive buying pressure, suggesting traders are purchasing TON in the spot market while simultaneously shorting futures to hedge their exposure rather than expressing pure directional conviction through leverage. A Caution Signal Beneath the Surface Despite Bitcoin's climb to $81,490, a broader derivatives caution signal warrants attention. The OI-adjusted 24-hour CVD is negative for Bitcoin and most major tokens -- with ADA, TON, and M as the notable exceptions. The negative reading indicates that the rally above $80,000 is not being strongly supported by aggressive derivatives buying, raising the risk that price gains could lack follow-through if spot demand weakens. Bitcoin's own open interest has risen approximately 3% to 785,000 BTC, approaching the recent record near 800,000 BTC -- a level that historically has preceded periods of elevated volatility. Derivatives activity in Ether, XRP, and Solana has been relatively muted over the past 24 hours, suggesting a selective rather than broad-based market expansion. Implied Volatility Rebounds Sharply Bitcoin's 30-day implied volatility index BVIV jumped 5% on Monday -- its sharpest single-day increase since mid-March -- moving back above 40% from multi-month lows. The rebound from suppressed volatility levels bears watching. A continued rise in implied volatility can signal growing institutional hedging demand or expectations of larger price swings, and in some historical cases has coincided with risk aversion and unwinding of recent gains. Ether's equivalent EVIV index has yet to show a similar pickup. Traditional markets are showing early hedging signals as well, with social media chatter pointing to large purchases of VIX call options -- instruments that pay off if Wall Street's fear gauge spikes, typically in response to an equity market selloff. On Deribit, risk reversals for both Bitcoin and Ether remain skewed toward puts across maturities, meaning downside protection continues to command a premium over upside exposure. Analysts interpret this less as outright bearishness and more as a structural shift in market composition -- institutions playing a larger role tend to systematically hedge downside risk or generate yield through covered call selling, producing a market that is more hedged and less euphoric than in previous crypto cycles. DeFi and Altcoins Lead the Rotation The session's clearest trend is a rotation from crypto majors into more speculative plays. The CoinDesk DeFi Select Index is the best-performing benchmark on Tuesday, up 2.7% since midnight UTC, with Ethena (ENA) surging 6.8% and ONDO gaining 3.7% -- the latter continuing its rally following the Clarity Act stablecoin yield compromise that is expected to benefit real-world asset token structures. The CoinDesk 5, weighted toward crypto majors, is the session's worst performer with just a 0.5% gain -- a reflection of capital rotating into higher-beta opportunities as broader sentiment improves. CoinMarketCap's Altcoin Season indicator has ticked up to 41 out of 100, signaling neutral but warming sentiment toward the sector following a multi-month downtrend. The reading remains well below the 75 threshold that historically signals a full altcoin season, but the directional improvement is consistent with the rotation dynamic visible in Tuesday's benchmark performance.