---
title: "Bitcoin drops to $81,400 as Asian chip stocks tumble, options traders seek downside protection"
description: "2026-10-20にCoinDeskが報道。 CoinDesk: “Bitcoin slipped 0.5% to around $81,400 even after the biggest daily spot ETF inflow in nearly a month as South Korea's Kospi index fell 3.7% on AI worries.”"
language: ja
canonical: "https://whycoinmoves.com/ja/events/chip-2-bitcoin-drops-81-400-asian-dcac9f20f3bb08"
published: 2026-10-21T00:36:57.000Z
updated: 2026-10-21T00:36:57.000Z
indexable: false
---

# Bitcoin drops to $81,400 as Asian chip stocks tumble, options traders seek downside protection

2026-10-20にCoinDeskが報道。 CoinDesk: “Bitcoin slipped 0.5% to around $81,400 even after the biggest daily spot ETF inflow in nearly a month as South Korea's Kospi index fell 3.7% on AI worries.”

Attributed sources: [CoinDesk](<https://www.coindesk.com/markets/2026/10/20/bitcoin-drops-to-usd81-400-as-asian-chip-stocks-tumble-options-traders-seek-downside-protection>)

## Key facts

CoinDesk: “Bitcoin slipped 0.5% to around $81,400 even after the biggest daily spot ETF inflow in nearly a month as South Korea's Kospi index fell 3.7% on AI worries.”
Evidence strength: 単一情報源, 1 publisher group(s) (CoinDesk); this describes source coverage, not truth or causation.
検知後の完了したリターン観測枠はまだありません。

## Returns after site detection

| Window | Return | BTC | Difference from BTC | Actual sampled interval (UTC) | Source |
| --- | --- | --- | --- | --- | --- |
| 5分 | — | — | — | — | — |
| 1時間 | — | — | — | — | — |
| 24時間 | — | — | — | — | — |

## Historical hourly baseline

| Metric | Value |
| --- | --- |
| Ready | false |
| Coverage | 0.0% (0/720) |
| Median absolute hourly return | — |
| 99th percentile of absolute hourly returns | — |
| BTC beta | — |
| Source / cutoff (UTC) | — / 21/10/2026, 00:36 |

## Claims and open questions

- No independently verified causal explanation is available.

## Source evidence

- [Bitcoin drops to $81,400 as Asian chip stocks tumble, options traders seek downside protection](<https://www.coindesk.com/markets/2026/10/20/bitcoin-drops-to-usd81-400-as-asian-chip-stocks-tumble-options-traders-seek-downside-protection>) — CoinDesk; published 20/10/2026, 10:22; received 20/10/2026, 10:26 (UTC).


## Recent CHIP events and market reactions

公開基準を満たした他のCHIPイベントはまだありません。

- [Full coin archive](<https://whycoinmoves.com/ja/coins/chip-2>)

## 他銘柄の直近の価格急変動イベント

- [PEARL: PEARLはなぜ1分で2.38%下落したのか？根拠・市場データ検証 · 2026-10-23](<https://whycoinmoves.com/ja/events/pearl-2-move-1792762740>)
- [ZEC: ZECはなぜ1分で0.74%下落したのか？根拠・市場データ検証 · 2026-10-23](<https://whycoinmoves.com/ja/events/zcash-move-1792720080>)
- [SHIB: SHIBはなぜ1分で0.74%上昇したのか？根拠・市場データ検証 · 2026-10-23](<https://whycoinmoves.com/ja/events/shiba-inu-move-1792719780>)
- [価格急変動](<https://whycoinmoves.com/ja/topics/market>)

## Research for this archive

- [Altcoin beta to Bitcoin: BTC, ETH, SOL and DOGE hourly returns](<https://whycoinmoves.com/ja/research/hourly-returns-and-bitcoin-beta.md>)
- [Crypto liquidity and order book depth: a historical data audit](<https://whycoinmoves.com/ja/research/order-book-data-quality.md>)
- [Perpetual funding rates and annualized yield: a 2025 comparison](<https://whycoinmoves.com/ja/research/funding-rates-versus-investor-returns.md>)
- [Bitcoin halving and bull markets: evidence from four halvings](<https://whycoinmoves.com/ja/research/bitcoin-halving-and-market-cycles.md>)

[Methods and limitations](<https://whycoinmoves.com/ja/methodology>)
Publisher count is not independent evidence count. Price changes cannot verify news or prove causation.