New 'bitcoin cash' crashes 30% Friday in volatile first week of trading; Original bitcoin steady

• Bitcoin split into bitcoin and "bitcoin cash" Tuesday.
• While  bitcoin has held steady, bitcoin cash swung wildly this week, climbing  above $700 Wednesday and plunging Friday below $300. 
• Some major digital currency exchanges said in the last day they now accept bitcoin cash deposits.

 Bitcoin is holding up well against its offshoot rival in its wild first week of trading.  The new "bitcoin cash" plunged  30 percent Friday to below $300, while the original cryptocurrency edged  higher and approached $2,900, nearly triple in value for the year. Bitcoin split into bitcoin  and bitcoin cash Tuesday, and the new digital currency has swung  dramatically amid limited trading access. Bitcoin cash leaped from  around $220 to above $700 briefly Wednesday, before crashing Friday to  $287 in early afternoon trade, according to CoinMarketCap, which tracks  prices across exchanges. 

Digital currency enthusiasts attributed  the decline in the last day to an increase in exchanges accepting  deposits of bitcoin cash.  Bitcoin cash one-day performance  Source: CoinMarketCap Investors who held bitcoin on  most exchanges as of Tuesday morning, when the split happened, should  have automatically received the equivalent amount of bitcoin cash. A major digital currency  exchange, Bitfinex, tweeted Friday morning it now accepted bitcoin cash  deposits and withdrawals, while another large exchange, Bittrex began  accepting bitcoin cash deposits Thursday. Popular digital currency  wallet, or storage site, Trezor, also announced Thursday that it  restored customer access to bitcoin cash.  Coinbase's GDAX exchange  initially said it would not give customers bitcoin cash, but announced  late Thursday it would support the new currency by Jan. 1, 2018. "I suspect the price drop is  people selling newly minted" bitcoin cash, said Brian Kelly, a CNBC  contributor and CEO of BKCM, which runs a digital assets strategy. Nearly two-thirds of trading in  bitcoin cash was being done in bitcoin, and about 43 percent of those  transactions were conducted on Bittrex, according to CryptoCompare. U.S.  dollar transactions in bitcoin cash accounted for 22 percent, the site  showed. The original bitcoin traded  Friday nearly 3 percent higher at $2894.91, holding near Tuesday's  highs, according to CoinDesk. Bitcoin hit a record high of $3,025 in  June, briefly more than tripling in value for the year.  Rival digital currency ethereum traded 2 percent lower near $219, according to CoinDesk. Ethereum has surged more than 2,000 percent this year.