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After 12:00 pm on November 15th, Bitcoin Cash (BCH) will implement a network upgrade of the new rules protocol. After the lock is upgraded, the next block will enforce MINIMALDATA in the script, and the opcodes OP_Checkmultisig and OP_Checkmultisigverify will be upgraded to accept Schnorr signatures.

code delivery

This Friday, Bitcoin Cash will undergo a semi-annual protocol upgrade as planned. This upgrade adds two new features. Developers have been discussing this protocol upgrade for several months, and the developers also explained in detail at the meeting how these new features and changes will apply to the BCH roadmap. In fact, since August 1, 2017, BCH developers have developed a large number of protocol features unique to BCH.

For example, BCH previously raised the block limit to 32MB, which means that BCH has a transaction throughput capacity that far exceeds 1MB. In September 2018, BCH processed millions of transactions in one day, far exceeding BTC's single-day transaction limit, setting a record Digital currency transaction volume history; as another example, Bitcoin Cash developers have re-enabled the previously disabled Satoshi opcode, which can support various transactions, compilers and other functions. The added opcode OP_Checkdatasig can be used to calculate the computing power of the block and verify signatures in an automated way; Bitcoin Cash developers also increased the default data carrier size of the BCH network to 220 bytes. All in all, this is a Bitcoin Cash with more features and greater transaction capabilities.

Of course, the BCH development process is far more than that, and developers are planning a more ambitious blueprint. At block height 582680, the basic Schnorr signature protocol was added, and the canonical transaction order (also known as CTOR) was implemented in the previous upgrade of the Schnorr function. According to Coin
According to Dance’s statistics, BCH developers have added 20 different new explicit features to the protocol, with another 20 in development, as well as 15 features under discussion, and two new features yet to be activated.

new explicit function

The first function of this upgrade is to eliminate ductility vectors on the BCH network through Minimaldata rules. The upgrade announcement on November 15 explained: “This eliminates the final BIP
62 malleability vector, meaning that most transactions on the Bitcoin Cash network (including all P2PKH transactions) will not be malleable in the future. "This can effectively protect the security of transactions.

There are many forms of malleability vectors in scriptSig and signatures, and BIP62 was introduced in 2014 to address these issues. Over the past few years, several types of solutions have been tried to deal with third-party malleability vectors. After next Friday's BCH network upgrade, most Bitcoin Cash transactions will be non-malleable, and the implementation of Minimaldata rules can also strengthen Simplified Payment Verification (SPV) clients.

The second feature added to BCH is support for OP_Checkmultisig and OP_Checkmultisigverify to complete the Schnorr signature feature added last time. The upgrade announcement reads:

"This upgrade adds support for OP_Checkmultisig. After the upgrade, all signature checking operations will support Schnorr signatures."

This means that through Schnorr signatures, the BCH network will allow more complex mechanisms for multi-signature transactions. The upgrade announcement on November 15 stated:

Schnorr aggregate signatures (using OP_Checksig) are one way to do multi-signatures, but they have different technical characteristics than previous Bitcoin multi-signatures and are far from a replacement for it.

BCH upgrade countdown

Bitcoin Cash users and enthusiasts welcome this BCH upgrade, and BCH network participants (developers, miners, wallets) have been preparing for these changes. Ordinary users do not need to perform any operations before the BCH network upgrade function changes take effect. However, miners and node operators will need to download and run a BCH client that supports the latest version on November 15th.

BCH development teams, Bitcoin ABC, Bitcoin Unlimited, BCHD, Flowee and Bitcoin
Verde is ready for the protocol upgrade. Currently, more than 68% of all publicly accessible BCH full nodes support the upgrade. While enthusiasts and fans who do not run a full node can use Coin
Check upgrade information online on data websites such as Dance or Fork Monitor. Before November 15, these two websites will announce the effective time of the protocol upgrade in advance.