Bitcoin gained 4.8% during the August 27, 2021 UTC reporting day on Kraken, where the exchange’s daily market report listed the asset at $49,074. The advance coincided with Federal Reserve Chair Jerome Powell’s Jackson Hole address, which left open a reduction in bond purchases during 2021 but emphasized that raising interest rates would require a separate, more demanding test.
The combination mattered because cryptocurrency markets were increasingly reacting to the same monetary-policy expectations shaping equities, bonds and foreign exchange. Powell did not mention bitcoin, promise prolonged stimulus or announce a policy change. The defensible event-day finding is narrower: crypto prices rose while investors processed a cautious path toward withdrawing pandemic-era support.
Kraken’s report recorded $291.2 million of bitcoin trading and $1.17 billion of spot volume across all markets during the UTC day. Total spot activity remained below the exchange’s stated 30-day average of $1.25 billion, indicating that the price advance did not arrive with exceptionally high venue-wide turnover by that comparison.
The rally extended beyond bitcoin
Ether gained 5.9% to $3,275.90 on Kraken, while cardano rose 16% to $2.9473 and solana gained 17% to $87.99. Those returns describe Kraken’s markets and UTC calculation window; they are not consolidated global returns or evidence that every venue recorded identical prices.
CoinMarketCap’s retained August 27 snapshot independently placed bitcoin at $49,058.67, up 4.51% over its displayed 24-hour window. It listed ether at $3,270.60, up 5.49%, and cardano at $2.9442, up 16.12%. The close agreement supports the direction and approximate scale of the move, although CoinMarketCap does not expose a precise snapshot time or a complete historical constituent-venue methodology on the page.
Neither source supplies an official worldwide close. Cryptocurrency trades continuously across fragmented venues, so prices and returns vary with exchange coverage, currency pair, cutoff and aggregation method. Kraken’s figures are therefore the primary measurement for this reconstruction; CoinMarketCap is corroboration rather than a substitute series.
What Powell actually said
Powell said most Federal Open Market Committee participants had believed at their July meeting that reducing asset purchases during 2021 could be appropriate if the economy developed broadly as anticipated. He also noted progress in employment alongside the renewed risk from the Delta variant and said officials would continue assessing incoming data.
Crucially, Powell said the timing and pace of reduced purchases were not intended to communicate the timing of an interest-rate increase. The federal-funds-rate test required maximum employment and inflation conditions that, in his assessment, had not yet been fully achieved. He also warned that tightening in response to temporary inflation could unnecessarily slow hiring and economic activity.
Reuters reported that the speech’s wait-and-see approach reassured investors in riskier assets. U.S. equities advanced, Treasury yields and the dollar declined, and market participants continued debating when the Federal Reserve might reduce its $120 billion in monthly Treasury and mortgage-backed-securities purchases.
Chronology supports context, not proof of cause
Contemporaneous CoinDesk reporting observed bitcoin moving from approximately $47,200 to $48,200 after Powell’s remarks, while the U.S. Dollar Index fell from 93.18 to 92.67. That sequence supports treating the speech as material macroeconomic context for the crypto rally.
It does not identify the buyers, prove that Powell caused every trade or measure the influence of derivatives, short covering and crypto-specific positioning. By the end of Kraken’s August 27 UTC window, the verified result was a broad digital-asset advance led by several large tokens, with bitcoin near $49,000 as markets absorbed a deliberately conditional Federal Reserve message.
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This article provides news and analysis, not investment, legal or tax advice. Digital assets are volatile and may result in total loss.

