---
title: "Key facts: BTCUSD Under $77K After $648M Outflows; SpaceX 18,712 BTC ~1.45B"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/287217956.md"
description: "BTCUSD dropped below $77,000 following $648M in ETF outflows. SpaceX's 18,712 BTC stake is valued at approximately $1.45B, down from $1.64B. BTCUSD may find support between $65,900 and $70,500. Current resistance levels are at $78,300 and $79,000. A report warns about quantum exposure in 30.2% of BTC supply and advises users to adopt quantum-resistant practices."
datetime: "2026-05-21T12:14:27.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/287217956.md)
  - [en](https://longbridge.com/en/news/287217956.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/287217956.md)
---

# Key facts: BTCUSD Under $77K After $648M Outflows; SpaceX 18,712 BTC ~1.45B

-   BTCUSD fell below $77,000 after heavy ETF outflows: about $648M redeemed Monday, easing to ~$70.5M by Wednesday as markets absorbed selling pressure.1
-   SpaceX holds 18,712 BTC bought for about $661M (~$35k/coin). Recent filings value the stake near $1.45B, down from ~$1.64B end‑2025 and ~$1.29B in Q1 2026.234
-   BTCUSD near $77,000 after Q1 2026 institutional filings showed mixed changes in exposure via MicroStrategy proxy, with net inflows across several managers and some stake reductions.5
-   On-chain HODL Waves show BTCUSD may bottom near $65,900–$70,500, with $70,500 cited as a key support where long-term holders concentrate.6
-   BTCUSD held a base above $76,000, trades \>$77,200 and the 100-hour MA, broke an hourly bearish trendline at $77,200. Next resistance: $78,300, then $79,000.7
-   Glassnode says ~4.12M BTC (30.2% of supply) are labeled quantum-exposed due to address reuse and custody practices, with operational exposure exceeding structural exposure.8
-   Report urges Bitcoin users to stop reusing keys, clean up addresses and adopt quantum-resistant formats; highlights BIP-360 Pay-to-Merkle-Root (P2MR) to limit quantum-exposed key paths.9

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