Does bitcoin send out 1099?
If you traded through a major exchange (Binance, Coinbase etc) they should, though they did not always in the past. You’re still supposed to report and pay taxes on any trades for profit that you’ve done, regardless of a 1099. And technically if you made significant profits you’re supposed to pay estimated taxes every quarter before year end. But the risk of not reporting really has "teeth" if you were issued a 1099. Good luck with the accounting on crypto, it’s complicated if you did a lot of buy/sell - that’s on you.
If you missed a 1099 on a prior year you might be at risk. If you didn’t miss a 1099 then you might be OK depending on how much effort the IRS wants to spend on backtracking this stuff.
I used Binance and even in the years before they issued 1099’s (IIRC 2021 and earlier), you could download a file (PDF, CSV) with all your raw transactions for the year. That doesn’t include the accounting number-crunching you need to report taxable income. It’s nasty stuff; I’m a software dev by trade so I wrote my own.