Bitcoin Cash Bucked the May 6 Pullback as an Upgrade Neared

Bitcoin Cash was the only one of the five largest cryptocurrencies to post a positive 24-hour change in CoinMarketCap’s May 6, 2018 historical snapshot, even as bitcoin retreated from the $10,000 level that traders had been testing. The divergence put BCH’s approaching protocol upgrade beside the broader market’s failed breakout attempt.

CoinMarketCap recorded bitcoin at $9,654.80, down 2.15% over its trailing 24-hour window. Ether was $792.31, down 3.17%; XRP was $0.8714, down 3.97%; and EOS was $17.47, down 1.59%. Bitcoin Cash stood at $1,765.69, up 0.55%, with a 23.69% seven-day gain.

Those values are an aggregator snapshot, not synchronized closing auctions. Crypto traded continuously, exchanges could print different prices, and CoinMarketCap’s surviving page does not state a conventional market-close time. The numbers establish a cross-market snapshot for May 6, not an investable global close.

Kraken showed the same split, with different magnitudes

Kraken’s own May 6 daily report strengthens the directional comparison while illustrating the measurement problem. The exchange displayed bitcoin at $9,515, down 2.26%, on $80.4 million of venue volume. Ether was $776.70, down 3.15%, on $90.7 million. Bitcoin Cash was $1,715.81, up 2.71%, on $26.4 million.

Kraken said $248 million traded across all of its markets, covering crypto and pairs denominated in euros, dollars, yen, Canadian dollars and pounds. That was Kraken activity only. It was not total worldwide turnover, and Kraken’s displayed instrument values should not be mixed with CoinMarketCap’s aggregated prices as though they shared one cutoff or construction method.

The two records nevertheless agree on the event-day pattern: BTC and ETH were lower over their reported daily windows, while BCH was higher. CoinMarketCap also placed BCH fourth by market capitalization at approximately $30.22 billion, behind BTC, ETH and XRP. A contemporaneous report published on May 7 described bitcoin as having approached $9,900 before retracing on May 6, but its later press-time prices include additional trading and are not used here as May 6 closes.

An upgrade was nine days away

The protocol context was concrete. Bitcoin ABC had announced on April 1 that Bitcoin Cash’s consensus rules were scheduled to change after the median timestamp of the most recent 11 blocks reached Unix time 1526400000, corresponding to May 15 at 16:00 UTC. Exact activation depended on when the qualifying block was mined.

The specification called for raising the hard block-size capacity limit to 32,000,000 bytes and re-enabling several scripting operations. Bitcoin ABC listed OP_CAT, OP_AND, OP_OR, OP_XOR, OP_DIV, OP_MOD, OP_SPLIT, OP_NUM2BIN and OP_BIN2NUM. It urged node operators to install Bitcoin ABC 0.17.1 or compatible software.

One detail requires precision: the 32-megabyte ceiling and opcode changes were consensus changes. The specification classified automatic future replay protection and a larger OP_RETURN relay allowance as recommended implementation changes, not consensus rules. Bitcoin ABC described the usable OP_RETURN data-carrier allowance as 220 bytes; the specification described 223 total bytes, a difference reflecting total script size versus data payload.

What the market record can and cannot show

The timing makes upgrade anticipation a plausible explanation for BCH’s relative strength, but the reviewed sources do not measure buyer motivation. No order-level study, attributable trader statement or controlled event analysis establishes that the scheduled fork caused the May 6 gain.

The defensible conclusion is narrower. On two differently constructed May 6 datasets, Bitcoin Cash rose while bitcoin and ether fell, and BCH entered the final nine days before a documented consensus upgrade with a large seven-day advance. That made protocol execution risk, node readiness and the market’s valuation of added capacity part of the same event-day story—without proving that one produced the other.