Spot Bitcoin ETFs: How January 2024 Rewrote Market Structure

On January 11, 2024, spot Bitcoin ETFs began trading in the US - after a decade of SEC rejections. This is not "just another news item": the very structure of who buys $BTC and how has changed.

What changed mechanically

• A new class of buyers. Retirement accounts, advisors, funds - capital that had previously been legally barred from $BTC gained a ticker in the brokerage terminal.
• Daily visible flow. ETF inflows and outflows are published every day - the market got a new key indicator. Days of record inflows and outflows began moving the price more than on-chain events.
• Supply absorption. Funds bought multiples of miners' daily issuance - a structural deficit impossible in past cycles.
• Financialization. ETF options, basis trades, arbitrage - $BTC has been fully integrated into the tradfi machine, with all its flows and derivative tails.

The flip side

Correlation with traditional markets has strengthened: the same hands buy and sell. Part of the inflow is not "belief in $BTC" but basis arbitrage (long ETF against short futures), which unwinds as the spread tightens. And most importantly: the flow works both ways - as seen on every big outflow day. We cover ETF flows and their impact in the section.