BTC's 72000 Put OI Looks Like Buying — The Tape Says Someone Was Dumping It

The 72000 put (Sept 18 expiry) is the loudest print on the BTC options tape today: 24h OI at the strike jumped +911.5 contracts, the single largest OI move on the entire put curve for the tenor and the headline driver behind the expiry's "put buying" tag from the OI-flow summary.

But taker-aggressor data flips the read. Across the last 48h, sell-side premium at 72000 totaled $630.7k against just $8.5k of buy-side premium — a seller-dominated tape, not a buyer one. The pressure escalated via three separate block prints:

Time (UTC)	Sell premium	Block trades	Block notional
Sep 1 10:00	$98.2k	1	$15.6M
Sep 1 14:00	$147.9k	1	$23.5M
Sep 2 13:00	$379.2k	3	$46.1M

That final hour alone (600 contracts, ~$46M notional) is the z=11.1 spike behind this flag. Net effect: OI grew because sellers opened new short-put positions into buyers who absorbed them off-tape — the opposite of retail hedging demand. The strike is also the expiry's largest put wall (1,201.5 contracts OI), meaning this block activity built directly into the existing gamma anchor rather than a fresh level.