What is Bitcoin Cash?
Bitcoin Cash is peer-to-peer electronic cash for the Internet. It is fully decentralized, with no central bank and requires no trusted third parties to operate.
Is Bitcoin Cash different from 'Bitcoin'?
Yes. Bitcoin Cash is the continuation of the Bitcoin project as peer-to-peer digital cash. It is a fork of the Bitcoin blockchain ledger, with upgraded consensus rules that allow it to grow and scale.
If I own Bitcoin, do I automatically own Bitcoin Cash too?
Yes. Because Bitcoin Cash is a fork of the ledger, that means you own the same amount of Bitcoin Cash as you did Bitcoin at the time of the forking block. However, if your Bitcoins are stored by a third party such as an exchange, then you must inquire with them about your cash.
How is transaction replay being handled between the new and the old blockchain?
Bitcoin Cash transactions use a new flag SIGHASH_FORKID, which is non standard to the legacy blockchain. This prevents Bitcoin Cash transactions from being replayed on the Bitcoin blockchain and vice versa.
Block explorer: https://blockchair.com/bitcoin-cash/blocks