Anyone know what the correct knot is for attaching your line to your boat anchor?

Well....there is something called an "Anchor Knot"

i use a bowline

Anchor hitch.

https://www.animatedknots.com/anchor/

I use a doubled up 1/2 of a grape vine knot on a large Bull Snap, makes it easy to change anchors to suit conditions and eliminates wear on the rode.

anchor knot on one end and a noose on your end.

A proper anchor rode should consist of the anchor fastened to a length of chain by a clevis, and then to a proper anchor rope with a metal thimble and a properly whipped eyelet. A clevis again connect this to the chain. In this way there is no knot.

Clevises should have a safety in the form of a piece of stainless wire to prevent loosening of the clevis.

YouTube and learn how to splice rope

Yep splice it. Once you do one you will see how easy it is and they hold.......jk

Get yourself some 3 braid and splice a thimble onto the end, then shackle a few feet of chain to that, then shackle the chain to the anchor. On a small boat, I would not bother mousing the shackle bolts, just nip them up tight.

Both Hutchy and Scuba1 described good methods.
Don't tie anchor line directly to the anchor, chain must be used between the two. However you do it, be sure to frequently inspect the line, shackles, etc..

I'munna wait til I hear from Savell. It will likely involve a drinking story or two, and numerous Grannie knots.

Thanks guys. This is on my new kayak which I will be using in the Keys in a couple weeks. Real small anchor, but wanted to make sure it stays tied.

If i had a boat I'd use a bowline. I teach my kids that knot. Works for about everything

A chain isn't necessary for all anchors, and likely not for a kayak. For the one I keep in FL, I just use a 2 lb dumbbell.

X2 He's not anchoring a 20 ft lund in 300 foot water . LOL some you guys crack me up.

You can make an anchor out of a wheel rotor(your choice of weight). Take a long bolt with an eye in one end and bolt it to any of the lug nuts holes with a nut on each side. Tie you line to the loop. cheap and most of us already have the rotors from one of our vehicles and are using them for drowning weights. Don't buy a anchor from the stores, make your own.......jk

I wouldn't have suggested chain if the OP said he was trying to anchor a kayak.
The suggestion about using a dumbbell with some sort of granny knot sounds sufficient.

Bowline is a great knot but it reduces the breaking strength of the line by 60%. All knots reduce the breaking strength of the rope however the bowline performs poorly in this regard. If you look at the mechanics of the knot, all of the strain is put on a single point in the line. The best part of a bowline is its ease to untie and fully recover the rope. Second best part is the security of the knot itself. As an anchor point under load it is a poor choice.

Depends on load i guess.