Block top - The block selection and length from 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 actually be the 101st transaction submitted by this account) https://getidealist.com/story22305449/5-easy-facts-about-blockchain-explorer-api-described-https-motionentrance-edu-np-profile-sticknurse6