ads.txt format for valid adsense
Ads.txt Google Adsenseexample combine ads.txt adsense with other ads:

google.com, pub-1037373295371110, DIRECT #video, banner, native, app
rubiconproject.com, 10306, DIRECT #banner
indexexchange.com, 183963, DIRECT #banner
indexexchange.com, 184913, DIRECT #banner
openx.com, 537147789, DIRECT #banner
openx.com, 538986829, DIRECT #banner
appnexus.com, 7161, DIRECT #banner
appnexus.com, 3364, RESELLER #native
facebook.com, 1325898517502065, DIRECT #video, banner, app
liveintent.com, 87, DIRECT #banner
taboola.com, 688168, DIRECT #native
triplelift.com, 4139, DIRECT #native
teads.com, 11643, DIRECT #outstream
teads.com, 11445, DIRECT #outstream
google.com, pub-8415620659137418, RESELLER #native