NEW YORK (Reuters) - Bitcoin's underlying software code could be split on Tuesday to create a clone called "Bitcoin Cash," potentially providing a windfall for holders of the digital currency.

The initiative is being led by a small group of mostly China-based bitcoin miners - who get paid in the currency for contributing computing power to the bitcoin network - who are not happy with proposed improvements to the currency's technology.

They have initiated what is known as a "fork" - where blockchain, a public ledger of all bitcoin transactions, splits into two potential paths - that is set to be activated on Aug. 1.

A fork, if it goes ahead, would be significant as it could create a new competitor for bitcoin, which remains the oldest and most valuable digital currency. It is not clear if the fork will happen and how much the new coin would be worth.

If the fork goes ahead on Tuesday, anyone owning bitcoins before the split will have access to an equal amount of Bitcoin Cash for free, which they will then be able to trade for fiat currencies - legal tender backed by an issuing government - or other digital currencies.

"This is somewhat like a stock split," said Jeff Garzik, chief executive and co-founder of Bloq, a blockchain company. "You go to sleep with 100 bitcoins and wake up in the morning with 100 bitcoins plus 100 'Bitcoin Cash', a new token."

Bitcoin averted a split two weeks ago, when its software developers and miners agreed to implement a software upgrade called the Bitcoin Improvement Proposal (BIP) 91.

BIP 91 was the first step toward a larger effort to upgrade bitcoin through software called SegWit2x, which would make the network faster at processing transactions, such as payments using the virtual currency.

The miners, a powerful segment of the bitcoin community, represent a network of computer operators who validate information on the blockchain. Since bitcoin is powered by open-source code, any group of coders can use it to create clone coins.

Futures of Bitcoin Cash are already trading on certain exchanges at around $282.40. Bitcoin traded at $2,806.27, according to coinmarketcap.com.

If the fork goes ahead, users will only be able to receive and sell the new token on certain digital currency exchanges and digital wallet providers, as several have decided not to support it, including Coinbase, BitMEX, and Bitstamp.

"We do not want to support any behavior whereby anyone can potentially split the bitcoin blockchain and effectively create free money out of nothing," said Greg Dwyer, head of business development at BitMEX.

Two other large exchanges, Kraken and Bitfinex, said they will allow users to trade Bitcoin Cash and will credit them with the same amount of the new token after the fork, if it goes ahead.

Reporting by Gertrude Chavez-Dreyfuss and Anna Irrera; Editing by Bill Rigby

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Bitcoin technology faces split, may create clone virtual currency - Reuters