https://xmrchain.net/api/version gets you the block height, so does https://xmrchain.net/api/networkinfo and https://xmrchain.net/api/search/[blockNumber] gets you the hash of a block, so it could check the latest block hash by querying xmrchain and the subject explorer and compare the results
https://xmrchain.net/api/versiongets you the block height, so doeshttps://xmrchain.net/api/networkinfoandhttps://xmrchain.net/api/search/[blockNumber]gets you the hash of a block, so it could check the latest block hash by querying xmrchain and the subject explorer and compare the results