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2. I have not had a chance to read the original article on side chains, but I am sure they deal with my next problem quite adequately. However it is not addressed in the above article. The primary problem that must be addressed with the notion of side chains, as I see it, would be the issue of the mining required to authenticate transactions and enter them into the block chain. The article mentions that side chain system more or less leaves the issue of verification within the side chain transactions as something of a black box, somewhat implying that they don’t have to be considered. But for any user, they would need to be both considered and understood. Such a process would presumably require mining verification of some kind, (our mental model must include consideration of the somewhat unusual verification method for bitcoin transactions themselves, – as everyone would agree, the verification process is not just a “checklist” of valid transaction strings. The validation process requires mining in much the same sense as mining new coin. None of this is mentioned or discussed in the article. ) As a result, the verification of side chain transactions outside the block chain introduces whole new layers of risk into the Bitcoin model, and new layers of unknowns.
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The Loom Network recently released their SDK which supports what they call “Dappchains,” an Ethereum layer-2 sidechain solution with each sidechain comprised of their own DPoS consensus mechanism. This enables highly scalable dapps, specifically games built using their tools. Loom emphasizes the earlier comment about sidechains enabling innovation in scalability, rather than providing it directly. Loom’s sidechains have their own set of rules and are used to offload computation from the primary Ethereum chain. Their sidechains are application-specific, meaning that they enable highly scalable dapps through an efficient consensus mechanism and can periodically be settled on the main Ethereum chain depending on their security needs. You can find more information on their model here.
The consensus mechanism involves ascertaining transaction validity and uniqueness. Smart contracts address the validity portion. To ensure uniqueness, the protocol program in Corda checks whether any other transaction has used any of the input states of this transaction. If no other transaction has used any of the input states, that this transaction is unique.
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Federated Blockchains operate under the leadership of a group. As opposed to public Blockchains, they don’t allow any person with access to the Internet to participate in the process of verifying transactions. Federated Blockchains are faster (higher scalability) and provide more transaction privacy. Consortium blockchains are mostly used in the banking sector. The consensus process is controlled by a pre-selected set of nodes; for example, one might imagine a consortium of 15 financial institutions, each of which operates a node and of which 10 must sign every block in order for the block to be valid. The right to read the blockchain may be public, or restricted to the participants.

Another technology that could see more widespread use in the coming years is side chains. A side chain is defined for one specific use case. There can be multiple side chains where different tasks are distributed accordingly for improving the efficiency of processing. Maybe one application needs to optimize for high speeds and another needs to optimize for large computations. In any case, side chains can be used to handle commercial blockchain usage. CryptoKitties would have greatly benefitted from an optimized high-speed side chain. At one point, they jammed up the Ethereum blockchain with 25% of all transactions coming from their application.


These kinds of blockchains are forks of the original implementations but deployed in a permissioned manner. Mainly hyped because the companies behind these chains want to onboard corporations in order to generate buzz around their their chain. It’s tolerable for proof of concepts or if they plan to move to public as soon as possible; otherwise they are just using the wrong set of tools for the job.
As RSK plans to host all types of clients and smart contracts: financial industry players, educational institutions, large importing companies, government and individuals, which means they are full on attack mode on Ethereum’s business model. There are endless opportunities within a market with unlimited potential and we could now see a first real competitor for Ethereum, that has a big hashrate, secure network, safer environment for developers, much higher throughput and solved scalability issues.

Unlike the other two-way peg mechanisms discussed in this article, SPV sidechains do not give direct control of real bitcoins on the main chain to a custodian; however, the ability for a majority of miners to produce and build upon fraudulent SPV proofs gives them indirect control over the funds, including the ability to send to themselves. Having said that, there are ways to mitigate this issue.
It might seem that this technology is beneficial for any business, but it is not. Quite often projects fail to justify their will of public or private blockchain implementation. The key reason to use blockchain is the inefficiency of existing centralized solution that is slow, expensive, and lacks transparency and reliability. In other cases, blockchain isn’t required.
So if you want to create a more secure Sidechain, we would seriously need to have a look at incentivizing miners in other ways. These could include things such as the Sidechain raising outside funding from investors in order to pay the miners. Staggering mining award so miners have an incentive to keep mining as they will be paid later on rather than at the time or the Sidechain could issue its own mining award on top of the already existing transaction fees and essentially just become an Altcoin.
Sidechain is a chain of blocks based on the main parental blockchain. Sidechains realize the new financial ecosystems via integration into Bitcoin. Relatively new to Bitcoin, the sidechain is an extension that enables the ability both to build a link between BTC and an altcoin and to create new independent services that work via the main Bitcoin blockchain. Using sidechains allows for the creation of various types of smart contracts, stocks, derivatives, etc. It is possible to develop a limitless number of Bitcoin or Ethereum-based sidechains with different tasks and features, assets of which will depend on the main blockchain’s volatility. It allows traditional blockchains to support several kinds of assets, payments, smart contracts and also to increase the level of security and anonymity of transactions.
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2. I have not had a chance to read the original article on side chains, but I am sure they deal with my next problem quite adequately. However it is not addressed in the above article. The primary problem that must be addressed with the notion of side chains, as I see it, would be the issue of the mining required to authenticate transactions and enter them into the block chain. The article mentions that side chain system more or less leaves the issue of verification within the side chain transactions as something of a black box, somewhat implying that they don’t have to be considered. But for any user, they would need to be both considered and understood. Such a process would presumably require mining verification of some kind, (our mental model must include consideration of the somewhat unusual verification method for bitcoin transactions themselves, – as everyone would agree, the verification process is not just a “checklist” of valid transaction strings. The validation process requires mining in much the same sense as mining new coin. None of this is mentioned or discussed in the article. ) As a result, the verification of side chain transactions outside the block chain introduces whole new layers of risk into the Bitcoin model, and new layers of unknowns.
Confidential Transactions — At present, all Bitcoin transactions are completely public, albeit pseudonymous. Confidential Transactions, as the name implies, conceal the amount being transferred to all except the sender, the recipient, and others they designate. The resulting transaction size is significantly larger, but includes a sizable “memo” field that can be used to store transaction or other metadata, and is still smaller than eg Zerocoin.(Note that this isn’t as confidential as Zerocash, which conceals both the amount and the participants involved in any transaction, through the mighty near-magic of zk-Snarks. Mind you, Zerocash would require an esoteric invocation ritual to initiate its network. No, really. But that’s a subject for a separate post.)
The second option will be to use sidechains. Blockstream first announced side chain in 2014 and published its whitepaper (https://blockstream.com/sidechai...). I believe in the future, bitcoin will have its desired flexibility with its sidechains. The idea of the sidechain is you can innovate and design your solution freely in the sidechains. These sidechains are independent, if they are failed or hacked, they won't damage other chains. So damage will be limited within that chain, for that reason you can be less conservative. Otherwise you would be more risk averse, if you had 42.5 billion dollar market cap like Bitcoin.
Hasta la fecha (Agosto del 2016), las sidechains sobre Bitcoin no son más que algo teórico. Una implementación de este tipo requeriría de un cambio en el código Bitcoin (hay miembros de la comunidad Bitcoin con gran prestigio, como es el caso de Peter Todd, que argumentan que una sidechain, tal y como la describe Blockstream en su paper, no podrían llevarse a la práctica en Bitcoin sin hacer un gran cambio, hard fork, en Bitcoin). En el mismo paper de blockstream se reconoce que una implementación de este tipo, la cual su teoría es simple pero su implementación compleja, se enfrenta a problemas que no está del todo claro que puedan solventarse (y no todos son de tipo técnico).
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