Someone Is Aggressively Selling the BTC 63k Put for July 31, Not Buying It

The BTC 63,000 put expiring July 31 (26 DTE, sitting at the current ATM strike) posted a taker-flow spike with a z-score of 50.3 — but the tape says sellers, not buyers, drove it.

In the 08:00-09:00 UTC hour, taker sell volume hit 86.9 BTC against just 4.6 BTC of buying, buyerAggression at 0.05, net premium -$200,043. Over the trailing 72 hours the strike ran net-seller for $211,935 (sell premium $243,679 vs buy $31,744), with zero block trades flagged in either window — this is screen-driven flow, not an OTC print.

Raw 24h OI delta at the strike shows puts up 61.3 contracts against calls up only 0.3 — a number that in isolation reads like protection buying. The aggressor tape says otherwise: someone is writing (selling to open) the 63k put and collecting premium, not buying downside insurance. Spot sits at 62,644.65, 2.16% below the 64,000 max-pain level for this expiry, and 25-delta skew is still put-tilted at -0.072, so the broader surface hasn't flattened — this looks like one strike's positioning, not a shift in the whole book.