Line 1, Column 2 missing '{' or object member name

I am attempting to utilize the /give command with the can_place_parameters. This is supposed to be the only set of parameters that works. However, every time I try to use it, I get this error.

"Line 1, Column 2 missing '}' or object member name"

Below are the two commands that I have been trying, only to get this result.

/give @p diamond_block 64 0 {can_place_on :

{blocks: true }

}

/give @p diamond_block 64 0 {minecraft : {can_place_on :

{blocks : true }

} }