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REAL-TIME PAYMENT BLOCKCHAIN
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GRAFT Major Network Update 1.4.2 (“v10”)

As previously announced, we have released network node version 1.4.2 (“v10”) for a major network update. This update will correct the emission curve by reducing block rewards by 50% starting at block 176,000, which will be reached around September 17, 2018.

The new block reward formula will be as following:

reward = (M – A) * 2^-19 * 10^-10 / 2

Where M is the maximum total supply and A is the current supply.

This correction will not change the maximum supply of GRAFT that will be ever created, it will just stretch the emission curve such that it will take longer to mine the maximum supply. All GRAFT supporters should benefit from the corrected emission formula because it will stabilize the growth of the circulating supply.

In addition, GRAFT v10 will drop the mining difficulty algorithm adjustment made in the previous (v9) major network update (LWMA+tweak) and return to a standard LWMA difficulty calculation. The adjustment was originally added in an attempt to make the difficulty drop faster after a network attack, as it was believed that such network attacks were responsible for block delays and network stalls in the turbulent days between the first (v8) and second (v9) major network updates. As it turned out, however, those issues were caused by an unrelated bug inherited from Monero and have been long-since fixed on Graft’s network (the fix did not require a fork).

In retrospect, the v9 algorithm adjustment had the unintended side effect of inducing larger swings in mining difficulty because it made difficulty drop too quickly. Over time, opportunistic miners learned to exploit those difficulty swings by mining on the graft network with huge hashrates whenever difficulty dropped to win a handful of low-difficulty blocks, then leaving the network as soon as difficulty increased again. This would, in turn, result in long block times that would then trigger another difficulty drop, thus repeating the cycle. While such difficulty shifts are unavoidable, the v9 difficulty adjustment made the swings a little worse and are being removed in this fork to help make the mining difficulty more stable.

The major network update means that each GRAFT network node must be updated to the new software version before the specified block/date. Otherwise, any node that isn’t updated will be on the wrong version of the blockchain. The source code and the Linux and Windows binaries are currently available for download. The installation instructions are unchanged.

As another reminder, a major network update means that if you are running the GRAFT network node (graftnoded daemon), you must upgrade it to the current software release as soon as possible. If you do not install the updated node before block 176,000, it will be disconnected from the mainnet after block 176,000.

Note that the users of GRAFT mobile and desktop wallets will not be affected by the upcoming major network update and don’t need to do anything—as long as they are still connected to the default proxy supernodes (if you are connected to your own supernode, however, do not forget to upgrade the underlying network node to stay on the right network).