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In Tokyo, the "Scaling Bitcoin" conference took place on Friday. Mark Friedenbach from Blockstream introduced a pioneering concept for Bitcoin. "Forward Blocks" should make it possible to make future, controversial changes to Bitcoin, z. For example, increasing block size or changing the proof of works without having to do a hard fork. The Forward Blocks solution would make it virtually obsolete for every node in the Bitoin network to update its software.

Friedenbach explained that Forward Blocks enables different blockchains with separate proof-of-work capabilities. This means that there is not just one blockchain into which each block can be written, but numerous blockchains. The idea is similar to the sharding of Ethereum that the blockchain decomposed into parts ("shards"). Friedenbachs forward blocks would break the data of the Bitcoin Blockchain likewise into different parts, further blockchains. In principle, these "forward blockchains" are not linked to each other and save their own transactions separately. However, there should be a synchronization between these (two) shards. Friedenbach [explained](http://diyhpl.us/wiki/transcripts/scalingbitcoin/tokyo-2018/forward-blocks/)

>One of the methods is the sharding. I'm talking about database-sharding. If we can have a forward blockchain, we could just as easily have 30 and have transactions from them separately, so each shard has its own UTXO set [...]. The information in a shard is not related to what happens in other shards. There has to be some way to transfer something between the shards, and there are some synchronization requirements, and it's the same mechanism we used earlier for the Coinbase rules.

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