I just successfully uploaded a torrent file of Bad Grandpa...

"transaction":"10642412362362062832"
"transaction":"8890568333316404006"
"transaction":"1535460422874810029"

"transaction":"1179892826929412347"
"transaction":"15361728591643904899"
"transaction":"7391161467813128888"

"transaction":"5379853517243551087"
"transaction":"2690159461525169747"

cost: 8 nxt.

It is in hex encoded base 64 format.