Block top - The block number and length in the blockchain (in blocks) on development of the present block Nonce - The transaction selection with the from address (bear in mind this starts at 0 so a nonce of 100 would actually be the 101st transaction submitted by this account) https://mediasocially.com/story5446583/a-review-of-blockchain-explorer-xrp-https-www-webwiki-ch-cryptoexplorerhub-com