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|submitted by BitcoinAllBot to BitcoinAll [link] [comments]|
[Today's Hot Tips]submitted by LOEXCHANGE to u/LOEXCHANGE [link] [comments]
1. [Summary of the main points of the Filecoin Miners Conference: 100,000 F rewards will be distributed to the top 20 miners]
On July 22, the Filecoin miner community teleconferencing was held at 9:00, Beijing time. The main points of the conference are summarized as follows:
On July 22, some Twitter netizens said that the Ethereum Gas fee increase has become ubiquitous. Although some developers said that the Ethereum beacon chain will be launched in November, it will take several years to completely solve the problem. Some netizens also said that the Ethereum Layer 2 expansion protocol, such as Optimistic Rollups and zk-rollup, has done a good job, and may not need ETH 2.0. In response, Vitalik Buterin responded that even though expansion is no longer so important, PoS is still very important.
3. [OMF is about to usher in the cloud mine halving]
According to news of LOEx on July 20, OMF (OrtaMineFund) official plan, OMF is about to usher in the cloud mining halving, and all OMF angel holding smart cloud mines will be halved.
[Today's market analysis]
Bitcoin (BTC)BTC rose slightly from around 9340 USDT in the early morning, rose to 9388.19 USDT and then fell slightly. At present, BTC continues to trade sideways around 9370 USDT. Mainstream currencies basically followed the trend of the market, rising slightly in the early morning and then fell slightly. BTC is currently reported at 9364.7 USDT on LOEx Global, an increase of 0.30% in 24h.
Let's take a look at the data on the LOEX main board. The mainstream currencies that have been declining before have generally seen a rise of more than 1%. 1% is insignificant, but it may be a signal for the upswing horn to sound, after all, this round is an overall rise.
Although the $9,000 support level has remained strong in the past 50 days, any slight negative indicators will attract more attention from the media and authorities. BTC has been unable to break through the $9,400 level in the past three weeks, leading some analysts to doubt the possibility of a positive breakthrough.
We must beware of the increase in the main version, so we must pay attention to its continuous volume performance. If it is an immeasurable increase, it is not necessary to chase it; if it is a continuous increase in volume, we must prepare for the second wave of market launch expectations, and be prepare to attack at any time. So we have to be patient and wait and see.
Support level: the first support level is 9200 points, the second support level is 9300 integers;
Resistance level: the first resistance level is 9400 points, the second resistance level is 9600 points.
LOEx is registered in Seychelles. It is a global one-stop digital asset service platform with business distribution nodes in 20 regions around the world. It has been exempted from Seychelles and Singapore Monetary Authority (MAS) digital currency trading services. Provide services and secure encrypted digital currency trading environment for 2 million community members in 24 hours.
submitted by dzr9127 to dot [link] [comments]
The Polkadot Telegram AMA below took place on June 10, 2020https://preview.redd.it/4ti681okap951.png?width=4920&format=png&auto=webp&s=e21f6a9a276d35bb9cdec59f46744f23c37966ef
Dieter Fishbein, Ecosystem Development Lead, Web3 Foundation
Logan Saether, Technical Education, Web3 Foundation
Will Pankiewicz, Master of Validators, Parity Technologies
Moderated by Dan Reecer, Community and Growth, Polkadot & Kusama at Web3 Foundation
Transcription compiled by Theresa Boettger, Polkadot Ambassador:
Dieter Fishbein, Ecosystem Development Lead, Web3 FoundationDan: Hey everyone, thanks for joining us for the Polkadot Launch AMA. We have Dieter Fishbein (Head of Ecosystem Development, our business development team), Logan Saether (Technical Education), and Will Pankiewicz (Master of Validators) joining us today.
We had some great questions submitted in advance, and we’ll start by answering those and learning a bit about each of our guests. After we go through the pre-submitted questions, then we’ll open up the chat to live Q&A and the hosts will answer as many questions as they can.
We’ll start off with Dieter and ask him a set of some business-related questions.
Dieter could you introduce yourself, your background, and your role within the Polkadot ecosystem?Dieter: I got my start in the space as a cryptography researcher at the University of Waterloo. This is where I first learned about Bitcoin and started following the space. I spent the next four years or so on the investment team for a large asset manager where I primarily focused on emerging markets. In 2017 I decided to take the plunge and join the space full-time. I worked at a small blockchain-focused VC fund and then joined the Polkadot team just over a year ago. My role at Polkadot is mainly focused on ensuring there is a vibrant community of projects building on our technology.
Q: Adoption of Polkadot of the important factors that all projects need to focus on to become more attractive to the industry. So, what is Polkadot's plan to gain more Adoption? [sic]A (Dieter): Polkadot is fundamentally a developer-focused product so much of our adoption strategy is focused around making Polkadot an attractive product for developers. This has many elements. Right now the path for most developers to build on Polkadot is by creating a blockchain using the Substrate framework which they will later connect to Polkadot when parachains are enabled. This means that much of our adoption strategy comes down to making Substrate an attractive tool and framework. However, it’s not just enough to make building on Substrate attractive, we must also provide an incentive to these developers to actually connect their Substrate-based chain to Polkadot. Part of this incentive is the security that the Polkadot relay chain provides but another key incentive is becoming interoperable with a rich ecosystem of other projects that connect to Polkadot. This means that a key part of our adoption strategy is outreach focused. We go out there and try to convince the best projects in the space that building on our technology will provide them with significant value-add. This is not a purely technical argument. We provide significant support to projects building in our ecosystem through grants, technical support, incubatoaccelerator programs and other structured support programs such as the Substrate Builders Program (https://www.substrate.io/builders-program). I do think we really stand out in the significant, continued support that we provide to builders in our ecosystem. You can also take a look at the over 100 Grants that we’ve given from the Web3 Foundation: https://medium.com/web3foundation/web3-foundation-grants-program-reaches-100-projects-milestone-8fd2a775fd6b
Q: On moving forward through your roadmap, what are your most important next priorities? Does the Polkadot team have enough fundamentals (Funds, Community, etc.) to achieve those milestones?A (Dieter): I would say the top priority by far is to ensure a smooth roll-out of key Polkadot features such as parachains, XCMP and other key parts of the protocol. Our recent Proof of Authority network launch was only just the beginning, it’s crucial that we carefully and successfully deploy features that allow builders to build meaningful technology. Second to that, we want to promote adoption by making more teams aware of Polkadot and how they can leverage it to build their product. Part of this comes down to the outreach that I discussed before but a major part of it is much more community-driven and many members of the team focus on this.
We are also blessed to have an awesome community to make this process easier 🙂
Q: Where can a list of Polkadot's application-specific chains can be found?A (Dieter): The best list right now is http://www.polkaproject.com/. This is a community-led effort and the team behind it has done a terrific job. We’re also working on providing our own resource for this and we’ll share that with the community when it’s ready.
Q: Could you explain the differences and similarities between Kusama and Polkadot?A (Dieter): Kusama is fundamentally a less robust, faster-moving version of Polkadot with less economic backing by validators. It is less robust since we will be deploying new technology to Kusama before Polkadot so it may break more frequently. It has less economic backing than Polkadot, so a network takeover is easier on Kusama than on Polkadot, lending itself more to use cases without the need for bank-like security.
In exchange for lower security and robustness, we expect the cost of a parachain lease to be lower on Kusama than Polkadot. Polkadot will always be 100% focused on security and robustness and I expect that applications that deal with high-value transactions such as those in the DeFi space will always want a Polkadot deployment, I think there will be a market for applications that are willing to trade cheap, high throughput for lower security and robustness such as those in the gaming, content distribution or social networking sectors. Check out - https://polkadot.network/kusama-polkadot-comparing-the-cousins/ for more detailed info!
Q: and for what reasons would a developer choose one over the other?A (Dieter): Firstly, I see some earlier stage teams who are still iterating on their technology choosing to deploy to Kusama exclusively because of its lower-stakes, faster moving environment where it will be easier for them to iterate on their technology and build their user base. These will likely encompass the above sectors I identified earlier. To these teams, Polkadot becomes an eventual upgrade path for them if, and when, they are able to perfect their product, build a larger community of users and start to need the increased stability and security that Polkadot will provide.
Secondly, I suspect many teams who have their main deployment on Polkadot will also have an additional deployment on Kusama to allow them to test new features, either their tech or changes to the network, before these are deployed to Polkadot mainnet.
Logan Saether, Technical Education, Web3 Foundation
Q: Sweet, let's move over to Logan. Logan - could you introduce yourself, your background, and your role within the Polkadot ecosystem?A (Logan): My initial involvement in the industry was as a smart contract engineer. During this time I worked on a few projects, including a reboot of the Ethereum Alarm Clock project originally by Piper Merriam. However, I had some frustrations at the time with the limitations of the EVM environment and began to look at other tools which could help me build the projects that I envisioned. This led to me looking at Substrate and completing a bounty for Web3 Foundation, after which I applied and joined the Technical Education team. My responsibilities at the Technical Education team include maintaining the Polkadot Wiki as a source of truth on the Polkadot ecosystem, creating example applications, writing technical documentation, giving talks and workshops, as well as helping initiatives such as the Thousand Validator Programme.
Q: The first technical question submitted for you was: "When will an official Polkadot mobile wallet appear?"A (Logan): There is already an “official” wallet from Parity Technologies called the Parity Signer. Parity Signer allows you to keep your private keys on an air-gapped mobile device and to interactively sign messages using web interfaces such as Polkadot JS Apps. If you’re looking for something that is more of an interface to the blockchain as well as a wallet, you might be interested in PolkaWallet which is a community team that is building a full mobile interface for Polkadot.
For more information on Parity Signer check out the website: https://www.parity.io/signe
Q: Great thanks...our next question is: If someone already developed an application to run on Ethereum, but wants the interoperability that Polkadot will offer, are there any advantages to rebuilding with Substrate to run as a parachain on the Polkadot network instead of just keeping it on Ethereum and using the Ethereum bridge for use with Polkadot?A (Logan): Yes, the advantage you would get from building on Substrate is more control over how your application will interact with the greater Polkadot ecosystem, as well as a larger design canvas for future iterations of your application.
Using an Ethereum bridge will probably have more cross chain latency than using a Polkadot parachain directly. The reason for this is due to the nature of Ethereum’s separate consensus protocol from Polkadot. For parachains, messages can be sent to be included in the next block with guarantees that they will be delivered. On bridged chains, your application will need to go through more routes in order to execute on the desired destination. It must first route from your application on Ethereum to the Ethereum bridge parachain, and afterward dispatch the XCMP message from the Polkadot side of the parachain. In other words, an application on Ethereum would first need to cross the bridge then send a message, while an application as a parachain would only need to send the message without needing to route across an external bridge.
Q: DOT transfers won't go live until Web3 removes the Sudo module and token holders approve the proposal to unlock them. But when will staking rewards start to be distributed? Will it have to after token transfers unlock? Or will accounts be able to accumulate rewards (still locked) once the network transitions to NPoS?A (Logan): Staking rewards will be distributed starting with the transition to NPoS. Transfers will still be locked during the beginning of this phase, but reward payments are technically different from the normal transfer mechanism. You can read more about the launch process and steps at http://polkadot.network/launch-roadmap
Q: Next question is: I'm interested in how Cumulus/parachain development is going. ETA for when we will see the first parachain registered working on Kusama or some other public testnet like Westend maybe?A (Logan): Parachains and Cumulus is a current high priority development objective of the Parity team. There have already been PoC parachains running with Cumulus on local testnets for months. The current work now is making the availability and validity subprotocols production ready in the Polkadot client. The best way to stay up to date would be to follow the project boards on GitHub that have delineated all of the tasks that should be done. Ideally, we can start seeing parachains on Westend soon with the first real parachains being deployed on Kusama thereafter.
The projects board can be viewed here: https://github.com/paritytech/polkadot/projects
Dan: Also...check out Basti's tweet from yesterday on the Cumulus topic: https://twitter.com/bkchstatus/1270479898696695808?s=20
Q: In what ways does Polkadot support smart contracts?A (Logan): The philosophy behind the Polkadot Relay Chain is to be as minimal as possible, but allow arbitrary logic at the edges in the parachains. For this reason, Polkadot does not support smart contracts natively on the Relay Chain. However, it will support smart contracts on parachains. There are already a couple major initiatives out there. One initiative is to allow EVM contracts to be deployed on parachains, this includes the Substrate EVM module, Parity’s Frontier, and projects such as Moonbeam. Another initiative is to create a completely new smart contract stack that is native to Substrate. This includes the Substrate Contracts pallet, and the ink! DSL for writing smart contracts.
Learn more about Substrate's compatibility layer with Ethereum smart contracts here: https://github.com/paritytech/frontier
Will Pankiewicz, Master of Validators, Parity Technologies
Q: (Dan) Thanks for all the answers. Now we’ll start going through some staking questions with Will related to validating and nominating on Polkadot. Will - could you introduce yourself, your background, and your role within the Polkadot ecosystem?A (Will): Sure thing. Like many others, Bitcoin drew me in back in 2013, but it wasn't until Ethereum came that I took the deep dive into working in the space full time. It was the financial infrastructure aspects of cryptocurrencies I was initially interested in, and first worked on dexes, algorithmic trading, and crypto funds. I really liked the idea of "Generalized Mining" that CoinFund came up with, and started to explore the whacky ways the crypto funds and others can both support ecosystems and be self-sustaining at the same time. This drew me to a lot of interesting experiments in what later became DeFi, as well as running validators on Proof of Stake networks. My role in the Polkadot ecosystem as “Master of Validators” is ensuring the needs of our validator community get met.
Q: Cool thanks. Our first community question was "Is it still more profitable to nominate the validators with lesser stake?"A (Will): It depends on their commission, but generally yes it is more profitable to nominate validators with lesser stake. When validators have lesser stake, when you nominate them this makes your nomination stake a higher percentage of total stake. This means when rewards get distributed, it will be split more favorably toward you, as rewards are split by total stake percentage. Our entire rewards scheme is that every era (6 hours in Kusama, 24 hours in Polkadot), a certain amount of rewards get distributed, where that amount of rewards is dependent on the total amount of tokens staked for the entire network (50% of all tokens staked is currently optimal). These rewards from the end of an era get distributed roughly equally to all validators active in the validator set. The reward given to each validator is then split between the validators and all their nominators, determined by the total stake that each entity contributes. So if you contribute to a higher percentage of the total stake, you will earn more rewards.
Q: What does priority ranking under nominator addresses mean? For example, what does it mean that nominator A has priority 1 and nominator B has priority 6?A (Will): Priority ranking is just the index of the nomination that gets stored on chain. It has no effect on how stake gets distributed in Phragmen or how rewards get calculated. This is only the order that the nominator chose their validators. The way that stake from a nominator gets distributed from a nominator to validators is via Phragmen, which is an algorithm that will optimally put stake behind validators so that distribution is roughly equal to those that will get in the validator set. It will try to maximize the total amount at stake in the network and maximize the stake behind minimally staked validators.
Q: On Polkadot.js, what does it mean when there are nodes waiting on Polkadot?**A (Will):**In Polkadot there is a fixed validator set size that is determined by governance. The way validators get in the active set is by having the highest amount of total stake relative to other validators. So if the validator set size is 100, the top 100 validators by total stake will be in the validator set. Those not active in the validator set will be considered “waiting”.
Q: Another question...Is it necessary to become a waiting validator node right now?A (Will): It's not necessary, but highly encouraged if you actively want to validate on Polkadot. The longer you are in the waiting tab, the longer you get exposure to nominators that may nominate you.
Q: Will current validators for Kusama also validate for Polkadot? How strongly should I consider their history (with Kusama) when looking to nominate a good validator for DOTs?A (Will): A lot of Kusama validators will also be validators for Polkadot, as KSM was initially distributed to DOT holders. The early Kusama Validators will also likely be the first Polkadot validators. Being a Kusama validator should be a strong indicator for who to nominate on Polkadot, as the chaos that has ensued with Kusama has allowed validators to battle test their infrastructure. Kusama validators by now are very familiar with tooling, block explorers, terminology, common errors, log formats, upgrades, backups, and other aspects of node operation. This gives them an edge against Polkadot validators that may be new to the ecosystem. You should strongly consider well known Kusama validators when making your choices as a nominator on Polkadot.
Q: Can you go into more details about the process for becoming a DOT validator? Is it similar as the KSM 1000 validators program?A (Will): The Process for becoming a DOT validators is first to have DOTs. You cannot be a validator without DOTs, as DOTs are used to pay transaction fees, and the minimum amount of DOTs you need is enough to create a validate transaction. After obtaining enough DOTs, you will need to set up your validator infrastructure. Ideally you should have a validator node with specs that match what we call standard hardware, as well as one or more sentry nodes to help isolate the validator node from attacks. After the infrastructure is up and running, you should have your Polkadot accounts set up right with a stash bonded to a controller account, and then submit a validate transaction, which will tell the network your nodes are ready to be a part of the network. You should then try and build a community around your validator to let others know you are trustworthy so that they will nominate you. The 1000 validators programme for Kusama is a programme that gives a certain amount of nominations from the Web3 Foundation and Parity to help bootstrap a community and reputation for validators. There may eventually be a similar type of programme for Polkadot as well.
Dan: Thanks a lot for all the answers, Will. That’s the end of the pre-submitted questions and now we’ll open the chat up to live Q&A, and our three team members will get through as many of your questions as possible.
We will take questions related to business development, technology, validating, and staking. For those wondering about DOT:
DOT tokens do not exist yet. Allocations of Polkadot's native DOT token are technically and legally non-transferable. Hence any publicized sale of DOTs is unsanctioned by Web3 Foundation and possibly fraudulent. Any official public sale of DOTs will be announced on the Web3 Foundation website. Polkadot’s launch process started in May and full network decentralization later this year, holders of DOT allocations will determine issuance and transferability. For those who participated in previous DOT sales, you can learn how to claim your DOTs here (https://wiki.polkadot.network/docs/en/claims).
Telegram Community Follow-up Questions Addressed Below
Q: Polkadot looks good but it confuses me that there are so many other Blockchain projects. What should I pay attention in Polkadot to give it the importance it deserves? What are your planning to achieve with your project?A (Will): Personally, what I think differentiates it is the governance process. Coordinating forkless upgrades and social coordination helps stand it apart.
A (Dieter): The wiki is awesome - https://wiki.polkadot.network/
Q: Over 10,000 ETH paid as a transaction fee , what if this happens on Polkadot? Is it possible we can go through governance to return it to the owner?A: Anything is possible with governance including transaction reversals, if a network quorum is reached on a topic.
A (Logan): Polkadot transaction fees work differently than the fees on Ethereum so it's a bit more difficult to shoot yourself in the foot as the whale who sent this unfortunate transaction. See here for details on fees: https://w3f-research.readthedocs.io/en/latest/polkadot/Token%20Economics.html?highlight=transaction%20fees#relay-chain-transaction-fees-and-per-block-transaction-limits
However, there is a tip that the user can input themselves which they could accidentally set to a large amount. In this cases, yes, they could proposition governance to reduce the amount that was paid in the tip.
Q: What is the minimum ideal amount of DOT and KSM to have if you want to become a validator and how much technical knowledge do you need aside from following the docs?A (Will): It depends on what the other validators in the ecosystem are staking as well as the validator set size. You just need to be in the top staking amount of the validator set size. So if its 100 validators, you need to be in the top 100 validators by stake.
Q: Will Web3 nominate validators? If yes, which criteria to be elected?A (Will): Web 3 Foundation is running programs like the 1000 validators programme for Kusama. There's a possibility this will continue on for Polkadot as well after transfers are enabled. https://thousand-validators.kusama.network/#/
You will need to be an active validator to earn rewards. Only those active in the validator set earn rewards. I would recommend checking out parts of the wiki: https://wiki.polkadot.network/docs/en/maintain-guides-validator-payout
Q: Is it possible to implement hastables or dag with substrate?A (Logan): Yes.
Q: Polkadot project looks very futuristic! But, could you tell us the main role of DOT Tokens in the Polkadot Ecosystem?A (Dan): That's a good question. The short answer is Staking, Governance, Bonding. More here: http://polkadot.network/dot-token
Q: How did you manage to prove that the consensus protocol is safe and unbreakable mathematically?A (Dieter): We have a research teams of over a dozen scientists with PhDs and post-docs in cryptography and distributed computing who do thorough theoretical analyses on all the protocols used in Polkadot
Q: What are the prospects for NFT?A: Already being built 🙂
Q: What will be Polkadot next roadmap for 2020 ?A (Dieter): Building. But seriously - we will continue to add many more features and upgrades to Polkadot as well as continue to strongly focus on adoption from other builders in the ecosystem 🙂
A (Will): https://polkadot.network/launch-roadmap/
This is the launch roadmap. Ideally adding parachains and xcmp towards the end of the year
Q: How Do you stay active in terms of marketing developments during this PANDEMIC? Because I'm sure you're very excited to promote more after this settles down.A (Dan): The main impact of covid was the impact on in-person events. We have been very active on Crowdcast for webinars since 2019, so it was quite the smooth transition to all-online events. You can see our 40+ past event recordings and follow us on Crowdcast here: https://www.crowdcast.io/polkadot. If you're interested in following our emails for updates (including online events), subscribe here: https://info.polkadot.network/subscribe
Q: Hi, who do you think is your biggest competitor in the space?A (Dan): Polkadot is a metaprotocol that hasn't been seen in the industry up until this point. We hope to elevate the industry by providing interoperability between all major public networks as well as private blockchains.
Q: Is Polkadot a friend or competitor of Ethereum?A: Polkadot aims to elevate the whole blockchain space with serious advancements in interoperability, governance and beyond :)
Q: When will there be hardware wallet support?A (Will): Parity Signer works well for now. Other hardware wallets will be added pretty soon
Q: What are the attractive feature of DOT project that can attract any new users ?A: https://polkadot.network/what-is-polkadot-a-brief-introduction/
A (Will): Buidling parachains with cross chain messaging + bridges to other chains I think will be a very appealing feature for developers
Q: According to you how much time will it take for Polkadot to get into mainstream adoption and execute all the plans set for this project?A: We are solving many problems that have held back the blockchain industry up until now. Here is a summary in basic terms:
Q: When will bitpie or imtoken support DOT？A: We are working on integrations on all the biggest and best wallet providers. ;)
Q: What event/call can we track to catch a switch to nPOS? Is it only force_new_era call? Thanks.A (Will): If you're on riot, useful channels to follow for updates like this are #polkabot:matrix.org and #polkadot-announcements:matrix.parity.io
A (Logan): Yes this is the trigger for initiating the switch to NPoS. You can also poll the ForceEra storage for when it changes to ForceNew.
Q: What strategy will the Polkadot Team use to make new users trust its platform and be part of it?A (Will): Pushing bleeding edge cryptography from web 3 foundation research
A (Dan): https://t.me/PolkadotOfficial/43378
Q: What technology stands behind and What are its advantages?A (Dieter): Check out https://polkadot.network/technology/ for more info on our tech stack!
Q: What problems do you see occurring in the blockchain industry nowadays and how does your project aims to solve these problems?A (Will): Governance I see as a huge problem. For example upgrading Bitcoin and making decisions for changing things is a very challenging process. We have robust systems of on-chain governance to help solve these coordination problems
Q: How involved are the Polkadot partners? Are they helping with the development?A (Dieter): There are a variety of groups building in the Polkadot ecosystem. Check out http://www.polkaproject.com/ for a great list.
Q: Can you explain the role of the treasury in Polkadot?A (Will): The treasury is for projects or people that want to build things, but don't want to go through the formal legal process of raising funds from VCs or grants or what have you. You can get paid by the community to build projects for the community.
A: There’s a whole section on the wiki about the treasury and how it functions here https://wiki.polkadot.network/docs/en/mirror-learn-treasury#docsNav
Q: Any plan to introduce Polkadot on Asia, or rising market on Asia?**A (Will):**We're globally focused
Q: What kind of impact do you expect from the Council? Although it would be elected by token holders, what kind of people you wish to see there?A (Will): Community focused individuals like u/jam10o that want to see cool things get built and cool communities form
If you have further questions, please ask in the official Polkadot Telegram channel.
submitted by CelesOS to u/CelesOS [link] [comments]
The consensus mechanism is one of the important elements of the blockchain and the core rule of the normal operation of the distributed ledger. It is mainly used to solve the trust problem between people and determine who is responsible for generating new blocks and maintaining the effective unification of the system in the blockchain system. Thus, it has become an everlasting research hot topic in blockchain.
This article starts with the concept and role of the consensus mechanism. First, it enables the reader to have a preliminary understanding of the consensus mechanism as a whole; then starting with the two armies and the Byzantine general problem, the evolution of the consensus mechanism is introduced in the order of the time when the consensus mechanism is proposed; Then, it briefly introduces the current mainstream consensus mechanism from three aspects of concept, working principle and representative project, and compares the advantages and disadvantages of the mainstream consensus mechanism; finally, it gives suggestions on how to choose a consensus mechanism for blockchain projects and pointed out the possibility of the future development of the consensus mechanism.
First, concept and function of the consensus mechanism
1.1 Concept: The core rules for the normal operation of distributed ledgers
1.2 Role: Solve the trust problem and decide the generation and maintenance of new blocks
1.2.1 Used to solve the trust problem between people
1.2.2 Used to decide who is responsible for generating new blocks and maintaining effective unity in the blockchain system
1.3 Mainstream model of consensus algorithm
Second, the origin of the consensus mechanism
2.1 The two armies and the Byzantine generals
2.1.1 The two armies problem
2.1.2 The Byzantine generals problem
2.2 Development history of consensus mechanism
2.2.1 Classification of consensus mechanism
2.2.2 Development frontier of consensus mechanism
Third, Common Consensus System
Fourth, Selection of consensus mechanism and summary of current situation
4.1 How to choose a consensus mechanism that suits you
4.1.1 Determine whether the final result is important
4.1.2 Determine how fast the application process needs to be
4.1.2 Determining the degree to which the application requires for decentralization
4.1.3 Determine whether the system can be terminated
4.1.4 Select a suitable consensus algorithm after weighing the advantages and disadvantages
4.2 Future development of consensus mechanism
Last lecture review: Chapter 1 Concept and Function of Consensus Mechanism plus Chapter 2 Origin of Consensus Mechanism
Chapter 3 Common Consensus Mechanisms (Part 1)
Figure 6 Summary of relatively mainstream consensus mechanisms
Source: Hasib Anwar, "Consensus Algorithms: The Root Of The Blockchain Technology"
The picture above shows 14 relatively mainstream consensus mechanisms summarized by a geek Hasib Anwar, including PoW (Proof of Work), PoS (Proof of Stake), DPoS (Delegated Proof of Stake), LPoS (Lease Proof of Stake), PoET ( Proof of Elapsed Time), PBFT (Practical Byzantine Fault Tolerance), SBFT (Simple Byzantine Fault Tolerance), DBFT (Delegated Byzantine Fault Tolerance), DAG (Directed Acyclic Graph), Proof-of-Activity (Proof of Activity), Proof-of- Importance (Proof of Importance), Proof-of-Capacity (Proof of Capacity), Proof-of-Burn ( Proof of Burn), Proof-of-Weight (Proof of Weight).
Next, we will mainly introduce and analyze the top ten consensus mechanisms of the current blockchain.
Work proof mechanism. That is, the proof of work means that it takes a certain amount of computer time to confirm the work.
Figure 7 PoW work proof principle
The PoW represented by Bitcoin uses the SHA-256 algorithm function, which is a 256-bit hash algorithm in the password hash function family:
Proof of work output = SHA256 (SHA256 (block header));
if (output of proof of work
New difficulty value = old difficulty value* (time spent by last 2016 blocks /20160 minutes)
Target value = maximum target value / difficulty value
The maximum target value is a fixed number. If the last 2016 blocks took less than 20160 minutes, then this coefficient will be small, and the target value will be adjusted bigger, if not, the target value will be adjusted smaller. Bitcoin mining difficulty and block generation speed will be inversely proportional to the appropriate adjustment of block generation speed.
-Representative applications: BTC, etc.
Proof of stake. That is, a mechanism for reaching consensus based on the holding currency. The longer the currency is held, the greater the probability of getting a reward.
PoS implementation algorithm formula: hash(block_header) =
Among them, coinage means coin age, which means that the older the coin age, the easier it is to get answers. The calculation of the coin age is obtained by multiplying the coins owned by the miner by the remaining usage time of each coin, which also means that the more coins you have, the easier it is to get answers. In this way, pos solves the problem of wasting resources in pow, and miners cannot own 51% coins from the entire network, so it also solves the problem of 51% attacks.
-Representative applications: ETH, etc.
Delegated proof of stake. That is, currency holding investors select super nodes by voting to operate the entire network , similar to the people's congress system.
The DPOS algorithm is divided into two parts. Elect a group of block producers and schedule production.
Election: Only permanent nodes with the right to be elected can be elected, and ultimately only the top N witnesses can be elected. These N individuals must obtain more than 50% of the votes to be successfully elected. In addition, this list will be re-elected at regular intervals.
Scheduled production: Under normal circumstances, block producers take turns to generate a block every 3 seconds. Assuming that no producer misses his order, then the chain they produce is bound to be the longest chain. When a witness produces a block, a block needs to be generated every 2s. If the specified time is exceeded, the current witness will lose the right to produce and the right will be transferred to the next witness. Then the witness is not only unpaid, but also may lose his identity.
-Representative applications: EOS, etc.
Delayed proof of work. A new-generation consensus mechanism based on PoB and DPoS. Miners use their own computing power, through the hash algorithm, and finally prove their work, get the corresponding wood, wood is not tradable. After the wood has accumulated to a certain amount, you can go to the burning site to burn the wood. This can achieve a balance between computing power and mining rights.
In the DPoW-based blockchain, miners are no longer rewarded tokens, but "wood" that can be burned, burning wood. Miners use their own computing power, through the hash algorithm, and finally prove their work, get the corresponding wood, wood is not tradable. After the wood has accumulated to a certain amount, you can go to the burning site to burn the wood. Through a set of algorithms, people who burn more wood or BP or a group of BP can obtain the right to generate blocks in the next event segment, and get rewards (tokens) after successful block generation. Since more than one person may burn wood in a time period, the probability of producing blocks in the next time period is determined by the amount of wood burned by oneself. The more it is burned, the higher the probability of obtaining block rights in the next period.
Two node types: notary node and normal node.
The 64 notary nodes are elected by the stakeholders of the dPoW blockchain, and the notarized confirmed blocks can be added from the dPoW blockchain to the attached PoW blockchain. Once a block is added, the hash value of the block will be added to the Bitcoin transaction signed by 33 notary nodes, and a hash will be created to the dPow block record of the Bitcoin blockchain. This record has been notarized by most notary nodes in the network. In order to avoid wars on mining between notary nodes, and thereby reduce the efficiency of the network, Komodo designed a mining method that uses a polling mechanism. This method has two operating modes. In the "No Notary" (No Notary) mode, all network nodes can participate in mining, which is similar to the traditional PoW consensus mechanism. In the "Notaries Active" mode, network notaries use a significantly reduced network difficulty rate to mine. In the "Notary Public Activation" mode, each notary public is allowed to mine a block with its current difficulty, while other notary public nodes must use 10 times the difficulty of mining, and all normal nodes use 100 times the difficulty of the notary public node.
Figure 8 DPoW operation process without a notary node
-Representative applications: CelesOS, Komodo, etc.
CelesOS Research Institute丨DPoW consensus mechanism-combustible mining and voting
Practical Byzantine fault tolerance algorithm. That is, the complexity of the algorithm is reduced from exponential to polynomial level, making the Byzantine fault-tolerant algorithm feasible in practical system applications.
Figure 9 PBFT algorithm principle
First, the client sends a request to the master node to call the service operation, and then the master node broadcasts other copies of the request. All copies execute the request and send the result back to the client. The client needs to wait for f+1 different replica nodes to return the same result as the final result of the entire operation.
Two qualifications: 1. All nodes must be deterministic. That is to say, the results of the operation must be the same under the same conditions and parameters. 2. All nodes must start from the same status. Under these two limited qualifications, even if there are failed replica nodes, the PBFT algorithm agrees on the total order of execution of all non-failed replica nodes, thereby ensuring security.
-Representative applications: Tendermint Consensus, etc.
Next Lecture: Chapter 3 Common Consensus Mechanisms (Part 2) + Chapter 4 Consensus Mechanism Selection and Status Summary
As the first DPOW financial blockchain operating system, CelesOS adopts consensus mechanism 3.0 to break through the "impossible triangle", which can provide high TPS while also allowing for decentralization. Committed to creating a financial blockchain operating system that embraces supervision, providing services for financial institutions and the development of applications on the supervision chain, and formulating a role and consensus ecological supervision layer agreement for supervision.
The CelesOS team is dedicated to building a bridge between blockchain and regulatory agencies/financial industry. We believe that only blockchain technology that cooperates with regulators will have a real future. We believe in and contribute to achieving this goal.
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In yet another landmark product update, SWFT Blockchain has launched SWFT Lending, a pledged collateral lending service. SWFT Blockchain users are now able to borrow up to 200,000 USD Tether (USDt) or 20 Bitcoin (BTC) in just a few seconds.
In order to borrow money, users have to access the lending page on the SWFT Blockchain app and select an amount of BTC or USDt to borrow and the time period they want to borrow it for. SWFT Blockchain will then calculate the interest rate and the pledge that the users will need to pay as collateral. Once the pledge is paid in either BTC or USDt, the money will be sent to the user’s SWFT Blockchain account.
Once users receive the loan, they are free to do as they wish with the money. They may use the loan to trade, take advantage of other financial services on on SWFT Blockchain, or withdraw it to other wallets. The only thing users are required to do is repay the loan before the loan period is over. They can always check how much time is left on their loan on the SWFT Lending page.
What’s the pledge? The pledge is the amount users ‘pledge’ to us that serves as collateral in case they are unable to repay their loan. We are currently accepting BTC and USDt with a pledge rate of 70%. That means that if a user pledges 10 BTC at a pledge rate of 70%, they can borrow the USDt equivalent of 7 BTC.
What about interest? The interest is charged in advance at a daily rate of 0.06% The latest feature to be added to SWFT Blockchain will begin giving users more liquidity tools in the BTC/USDt market and will gradually expand to other markets. SWFT Lending is a testament to the increasingly diverse product offering included in the SWFT Blockchain wallet app and the team’s commitment to becoming the ultimate one-stop-shop for all your crypto needs. You can now download the latest update of the SWFT Blockchain app on the App Store or Google Play and take advantage of SWFT loans and all other features like 0.1% fee swaps, decentralized swaps, SWFT Pay, SWFT Red Packets, and more!
About SWFT Blockchain Founded in 2017, SWFT Blockchain is a next-generation, worldwide cross-chain transfer protocol and payment network. SWFT Blockchain’s technology combines blockchain, machine learning and big data to enable direct swaps between nearly 200 cryptocurrencies at record speeds. SWFT Blockchain’s wallet app features one-click in-wallet transfers, decentralized transfers, red packets, and peer to peer payments using SWFT Pay; offering a fast, affordable, and secure cryptocurrency experience. Meanwhile, SWFT Blockchain’s cryptocurrency transfer protocol enables users of some of the top cryptocurrency wallets to swap cryptocurrencies at the best rates, with record speeds and super low fees, without leaving their wallet. SWFT Blockchain has received funding from top VCs, including Draper Dragon and was in the first cohort of startups at Berkeley Blockchain Xcelerator.
This article was first posted on Medium: https://medium.com/swlh/blockchain-in-insurance-use-cases-and-implementations-a42a00ebcd91
Almost all major insurers are planning to integrate blockchain by 2021, according to PwC. At first glance, such a high level of commitment to new tech may seem surprising in an old and traditional industry such as insurance. However, enterprise blockchain adoption is poised to help insurers significantly cut costs, become more responsive to customers, and write more business.
Two recurring themes throughout this post are that:
Insurance Growth Rates (CAGR) 2012–17. Source: EY
A recent EY insurance market report showed low growth rates for Life insurance and Non-Life insurance outside Asia Pacific. Digging deeper, Life insurance premiums in the US declined by 0.4% from 2012–17.
Insurers find themselves needing to reduce operating costs and write business more effectively. While blockchain is not a magic elixir, proper adoption will help address these needs.
What is Blockchain?In their book “Blockchain Revolution,” authors Don and Alex Tapscott describe blockchain as “an incorruptible digital ledger of economic transactions that can be programmed to record not just financial transactions but virtually everything of value.”
Organizations need secure ways to record transactions and manage information flows, making blockchain’s appeal easy to see. Blockchains ensures that:
Enterprise blockchains have the following characteristics: