Bitcoin cash hard fork

nChain announced on August 16 that it would launch its own full node, Bitcoin SV (for Satoshi's Vision). That full node contrasts directly with Bitcoin ABC in three main ways who will become the dominant chain?.

First, Bitcoin ABC wants to use a new opcode (or command), OP_CHECKDATASIG, which would "enable uses such as the use of oracles and cross-chain atomic contracts." In short, Wright wants to curb the adoption of any opcodes that would litter the network with non-cash transactions. For Wright, cash is the network's primary utility.

Second, Bitcoin ABC introduces canonical transaction ordering in v0.18.0. Canonical transaction ordering reduces how much data needs to be sent between nodes. The transition to this type of ordering may help scale the network in the future.

But that's too late for big block supporters, because the final and most important disparity between the software is block size. Bitcoin SV wants the maximum block size to be set at 128MB. Bitcoin ABC, meanwhile, sees the current 32 MB as a more reasonable limit for now.