Chainlink, Cardano, other blockchain groups push SEC for clearer crypto rules

A shared digital ledger in which records are grouped into blocks and linked so that past entries are very hard to change.

It underpins cryptocurrencies and is tested for payments, supply tracking and record keeping.

A digital currency secured by cryptography and recorded on a blockchain, without a central bank issuing it.

Crypto prices are volatile, and governments are still deciding how to regulate it.