Block top - The block selection and duration of the blockchain (in blocks) on creation of the current block Nonce - The transaction range for that from address (bear in mind this starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://bookmarkspiral.com/story20381419/a-review-of-blockchain-explorer-xrp-https-md-un-hack-bar-de-0oxwjunrtqeqpltmmf-tlw