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Ce inseamna Blockchain pentru tarile in curs de dezvoltare

Din cand in cand vine o tehnologie care schimba totul. Pentru majoritatea observatorilor, ultimul care urmeaza aceasta tendinta este blockchain-ul. Are potentialul de a revolutiona totul, de la moneda la lanturile de aprovizionare. Mai mult decat atat, blockchain-ul are potentialul de a acoperi decalajul dintre lumea dezvoltata si tarile in curs de dezvoltare precum Bangladesh, ca niciodata.

Imaginati-va o zi in care identitatea si reputatia afacerii dvs. sunt accesibile instantaneu potentialilor investitori; o zi in care bijuteriile pe care le-ati importat in magazinul dvs. sunt urmarite in siguranta pana la mina; sau o zi in care toti cetatenii unei tari se afla pe un registru central, sigur, transparent si in care increderea este absoluta.

Aceasta este promisiunea blockchain-ului. Este facturata ca urmatoarea tehnologie cu scop general (GPT), cum ar fi roata, motorul cu aburi, electricitatea, semiconductorii si internetul dinaintea sa. Singura diferenta este ca, spre deosebire de GPT-urile anterioare, blockchain-urile se vor raspandi mult mai rapid in intreaga lume datorita infrastructurii globale de comunicatii si tarile in curs de dezvoltare precum Bangladesh ar putea vedea in curand impactul sau intr-o multitudine de sectoare.

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Deci, cum functioneaza de fapt? Ce face blockchain-ul care nu se putea face inainte? Ne uitam la aceasta mai jos.

Blockchain este o tehnologie de uz general a carei implementare cea mai faimoasa pana acum este Bitcoin . Criptomoneda care a cucerit lumea. Introdus pentru prima data in 2009 de pseudonimul Satoshi Nakamoto , este primul exemplu de ceea ce poate realiza implementarea corecta a tehnologiei blockchain. Dar departe de ultimul.

In termeni tehnici, un blockchain este un registru descentralizat, distribuit, orientat spre consens, pseudonim al tranzactiilor. Pentru prima data in istorie, ne permite sa stocam valoare in forma digitala.

Altfel spus, blockchain-urile sunt un exercitiu in contrast. Asta sunt ei. Este deschis, dar sigur; privat, dar distribuit; neincrezator, dar de incredere.

Face acest lucru combinand domeniile informaticii pentru a crea coloana vertebrala si economia pentru a atinge securitatea prin stimulente – Cryptoeconomics, daca vreti.

Acest lucru face dificil de inteles pentru majoritatea. Asa ca am trecut prin literatura si am ajuns la acronimul DICT pentru a descrie un blockchain pentru un public larg.

De asemenea, iata o explicatie MASSIV simplificata de la Richie Etwaru:

Un blockchain este un registru DICT . Intelesul este:

  • D ecentralizat si distribuit
  • I mmutable
  • C onsensus Condus
  • T ransparent

Sa analizam fiecare dintre acestea in detaliu.

Descentralizat si distribuit

Each computer on the blockchain is called a node. And these nodes have the characteristic of being both decentralized and distributed.

This means that control of the system rests with all the nodes, instead of a few. It makes the blockchain fault tolerant, attack resistant and collusion resistant. [For a detailed breakdown of what this means, check out Ethereum co-founder Vitalik Buterin’s blog clarifying the topic.]

This also means that nodes in a “trustless” network generate trust by themselves and hence allow for disintermediation of middlemen.

Source: Medium Article

Also check out the talk Buterin gave at TechCrunch disrupt, where he defines a blockchain as a decentralized network with shared memory.

Immutable

The second key characteristics of a blockchains is that the records are immutable. Once a block is created, it is linked to all the blocks that come after it. This means that if you wanted to change the 3rd block in a blockchain with 100 blocks, you would have to change ALL the blocks starting from the 3rd to the 100th block.

This is incredibly difficult to do due to the distributed and consensus driven nature of blockchains. Meaning, the moment you tried something like this, all the nodes in the system would recognize and prevent it.

Consensus Driven

Blockchains can be both decentralized and secure because they rely on the participants in the network themselves to verify the transactions. This happens through the “consensus” of the participants to mitigate what is known as the Byzantine General’s problem. This is a situation where some nodes in the system are malicious and try to insert false entries into the ledger and have to be prevented from doing so.

Different consensus mechanisms are used to, in effect make blockchains Byzantine Fault Tolerant (BFT). For public blockchains, these include Proof of Work (used by Bitcoin and Ethereum) and Proof of Stake (the mechanism Ethereum is trying to move to).

For private blockchains on the other hand, popular techniques are Practical Byzantine Fault Tolerance (PBFT) and its variations and other newer consensus mechanisms like Proof of Elapsed Time (PoET).

Consensus Protocol Type of Blockchain Current Implementations

It should be noted however that consensus mechanisms are still being perfected and we still have ways to go before we arrive at a secure, all purpose method that can be used in both public and private blockchains.

But as it stands, there is a tradeoff between public and private blockchains in terms of security. This relationship is depicted below.

Figure: The Privacy — Security Tradeoff of Blockchains

Transparent

The final feature that blockchains bring to the table is that of transparency. Every node in the network can trace the chain of blocks (ledger of transactions) all the way back to the genesis block. That means, no matter how many transactions are added to the blockchain, the records can always be traced all the way back to the starting block.

This enables a level of transparency that was previously hard to achieve in traditional systems and almost impossible in decentralized and distributed ones.

Source Link

There are broadly two types of blockchains. Permissioned and Non-Permissioned.

Non-Permissioned Blockchains

These blockchains are ones like Bitcoin where anyone can join the network by mining to validate transactions. They rely mostly on Proof of Work mechanisms (PoW) to validate transactions. This consensus mechanism makes the nodes in the network expend computer resources to add new blocks to the blockchain.

Any participant who wants to enter a false transaction into the ledger has to have the majority of the computer power in the system to make his transactions go through. This discourages such behavior as the resources that have to be spent to do this is far more than the payoff (in Bitcoins for example). This is how, in effect, cryptoeconomics works.

Permissioned Blockchains

In this type of blockchain, participants are pre-selected to be part of the network from the outset. These are applicable in industry settings where participants in the value chain don’t want outside parties to be privy to their information. A prominent example of this is the framework built by IBM and the Linux Foundation called Hyperledger. It allows different industries to tailor and implement blockchains to their needs.

Blockchain platforms such as Hyperledger are set to expedite adoption of the technology throughout different industries across the globe in the near future.

A brief comparison of the two types of blockchains are illustrated in the table below.

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Din cand in cand vine o tehnologie care schimba totul. Pentru majoritatea observatorilor, ultimul care urmeaza aceasta tendinta este blockchain-ul. Are potentialul de a revolutiona totul, de la moneda la lanturile de aprovizionare. Mai mult decat atat, blockchain-ul are potentialul de a acoperi decalajul dintre lumea dezvoltata si tarile in curs de dezvoltare precum Bangladesh, ca niciodata.Imaginati-va o zi in care identitatea si reputatia afacerii dvs. sunt accesibile instantaneu potentialilor investitori; o zi in care bijuteriile pe care le-ati importat in magazinul dvs. sunt urmarite in siguranta pana la mina; sau o zi in care toti cetatenii unei tari se afla pe un registru central, sigur, transparent si in care increderea este absoluta.Aceasta este promisiunea blockchain-ului. Este facturata ca urmatoarea tehnologie cu scop general (GPT), cum ar fi roata, motorul cu aburi, electricitatea, semiconductorii si internetul dinaintea sa. Singura diferenta este ca, spre deosebire de GPT-urile anterioare, blockchain-urile se vor raspandi mult mai rapid in intreaga lume datorita infrastructurii globale de comunicatii si tarile in curs de dezvoltare precum Bangladesh ar putea vedea in curand impactul sau intr-o multitudine de sectoare. Array Deci, cum functioneaza de fapt? Ce face blockchain-ul care nu se putea face inainte? Ne uitam la aceasta mai jos.Blockchain este o tehnologie de uz general a carei implementare cea mai faimoasa pana acum este Bitcoin . Criptomoneda care a cucerit lumea. Introdus pentru prima data in 2009 de pseudonimul Satoshi Nakamoto , este primul exemplu de ceea ce poate realiza implementarea corecta a tehnologiei blockchain. Dar departe de ultimul.In termeni tehnici, un blockchain este un registru descentralizat, distribuit, orientat spre consens, pseudonim al tranzactiilor. Pentru prima data in istorie, ne permite sa stocam valoare in forma digitala.Altfel spus, blockchain-urile sunt un exercitiu in contrast. Asta sunt ei. Este deschis, dar sigur; privat, dar distribuit; neincrezator, dar de incredere. selena gomez porno voffice1.campaignsender.com.br video porno teen fsfield.com xvideo porno auryan.net free video porno hunduonu.andiamo.biz porno scato raikou.us xxn porno hswac.com porno brasil kelleyanderson.com porno pied phantom2040.biz porno rebeu facility.ironhorseauctions.org porno sous la douche attorneycostfinancing.com lust porno deafconferencing.com porno mere fille sarahcenters.com porno old splash.hume.vic.gov.au oksana porno www.3dcutting.net femme offerte porno european.placeit.com beeg porno www.kernelfactory.net porno bande drivermanagement.org monica bellucci porno www.ccedisp.com porno ub impersonalized.com porno français frere et soeur classicmoviestv.com Face acest lucru combinand domeniile informaticii pentru a crea coloana vertebrala si economia pentru a atinge securitatea prin stimulente - Cryptoeconomics, daca vreti.Acest lucru face dificil de inteles pentru majoritatea. Asa ca am trecut prin literatura si am ajuns la acronimul DICT pentru a descrie un blockchain pentru un public larg.De asemenea, iata o explicatie MASSIV simplificata de la Richie Etwaru:Un blockchain este un registru DICT . Intelesul este:D ecentralizat si distribuitI mmutableC onsensus CondusT ransparentSa analizam fiecare dintre acestea in detaliu.Descentralizat si distribuitEach computer on the blockchain is called a node. And these nodes have the characteristic of being both decentralized and distributed.This means that control of the system rests with all the nodes, instead of a few. It makes the blockchain fault tolerant, attack resistant and collusion resistant. [For a detailed breakdown of what this means, check out Ethereum co-founder Vitalik Buterin’s blog clarifying the topic.]This also means that nodes in a “trustless” network generate trust by themselves and hence allow for disintermediation of middlemen.Source: Medium ArticleAlso check out the talk Buterin gave at TechCrunch disrupt, where he defines a blockchain as a decentralized network with shared memory.ImmutableThe second key characteristics of a blockchains is that the records are immutable. Once a block is created, it is linked to all the blocks that come after it. This means that if you wanted to change the 3rd block in a blockchain with 100 blocks, you would have to change ALL the blocks starting from the 3rd to the 100th block.This is incredibly difficult to do due to the distributed and consensus driven nature of blockchains. Meaning, the moment you tried something like this, all the nodes in the system would recognize and prevent it.Consensus DrivenBlockchains can be both decentralized and secure because they rely on the participants in the network themselves to verify the transactions. This happens through the “consensus” of the participants to mitigate what is known as the Byzantine General’s problem. This is a situation where some nodes in the system are malicious and try to insert false entries into the ledger and have to be prevented from doing so.Different consensus mechanisms are used to, in effect make blockchains Byzantine Fault Tolerant (BFT). For public blockchains, these include Proof of Work (used by Bitcoin and Ethereum) and Proof of Stake (the mechanism Ethereum is trying to move to).For private blockchains on the other hand, popular techniques are Practical Byzantine Fault Tolerance (PBFT) and its variations and other newer consensus mechanisms like Proof of Elapsed Time (PoET).Consensus Protocol Type of Blockchain Current ImplementationsIt should be noted however that consensus mechanisms are still being perfected and we still have ways to go before we arrive at a secure, all purpose method that can be used in both public and private blockchains.But as it stands, there is a tradeoff between public and private blockchains in terms of security. This relationship is depicted below.Figure: The Privacy — Security Tradeoff of BlockchainsTransparentThe final feature that blockchains bring to the table is that of transparency. Every node in the network can trace the chain of blocks (ledger of transactions) all the way back to the genesis block. That means, no matter how many transactions are added to the blockchain, the records can always be traced all the way back to the starting block.This enables a level of transparency that was previously hard to achieve in traditional systems and almost impossible in decentralized and distributed ones.Source LinkThere are broadly two types of blockchains. Permissioned and Non-Permissioned.Non-Permissioned BlockchainsThese blockchains are ones like Bitcoin where anyone can join the network by mining to validate transactions. They rely mostly on Proof of Work mechanisms (PoW) to validate transactions. This consensus mechanism makes the nodes in the network expend computer resources to add new blocks to the blockchain.Any participant who wants to enter a false transaction into the ledger has to have the majority of the computer power in the system to make his transactions go through. This discourages such behavior as the resources that have to be spent to do this is far more than the payoff (in Bitcoins for example). This is how, in effect, cryptoeconomics works.Permissioned BlockchainsIn this type of blockchain, participants are pre-selected to be part of the network from the outset. These are applicable in industry settings where participants in the value chain don’t want outside parties to be privy to their information. A prominent example of this is the framework built by IBM and the Linux Foundation called Hyperledger. It allows different industries to tailor and implement blockchains to their needs.Blockchain platforms such as Hyperledger are set to expedite adoption of the technology throughout different industries across the globe in the near future.A brief comparison of the two types of blockchains are illustrated in the table below.

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