This utilizes the fact that miners decide which valid transactions they include in blocks anyway. (bitcoinmagazine.com)
To ensure valid transactions without the need for trust in a centralized institution, blockchain - based currencies typically rely on user participation to validate digital transactions and add them to the blockchain. (finder.com)
This records valid transactions and links them individually rather than as part of a block, which in theory makes transactions faster and cheaper to process. (cryptonews.com)