it can be built as I describe here https://leofinance.io/hive-167922/@urun/hive-advertisement-system-on-blockchain-level , important would be to accept 1 standard for the advertisement.
In general, there are 2 ways.
First: Posting key + add space would be placed in the advertisement area on content ( see my posting). On the later Version maybe an advertisement key with really low permissions, only for ads.
Or second, the advertiser buys the add like a custom JSON
image link ( banner) + target URL + keywords ( tags) could be looks like
add: url.banner.jpeg, HTTP://example.org. Tag: Blockchain , crypto , .... Blacklist: // Bid: 20 HDB, Date: Begin:_________ END:________
and with an advertisement standard, it can be used from the front ends.
Posted Using LeoFinance Beta