Block top - The block number and length of the blockchain (in blocks) on creation of the current block Nonce - The transaction selection for the 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://wise-social.com/story5979236/explorer-blockchain-things-to-know-before-you-buy-https-www-webwiki-co-uk-cryptoexplorerhub-com