# About MultiVAC Your MultiVerse Journey Starts Here! Welcome to the dev docs site of MultiVAC -- the All-dimensional Sharding Flexible Blockchain. **MultiVAC is the innovative sharding protocol and pioneering flexible computing framework.** As a high-throughput and flexible public blockchain platform, MultiVAC proposed an all-dimensional sharding solution to increase the TPS of the blockchain and was the first to propose a flexible computing framework so that developers could trade-off freely between the blockchain trilemma. ![](/files/abVhp8GBQprcDw4mS3eW) **There are 3 main features in our technology:** 1. High scalability. The all-dimensional sharding technology is well known as "Sharding Killer" in communities. 2. Linear expansion. The speed of 64 shards reaches over 30,000 TPS. In short, more shards equals higher performance. 3. Fair node operation. Everyone can participate in operating a node without competition. Nodes can be operated with a laptop or any ordinary PC. # History of MultiVAC MultiVAC was born in 2018. Geniuses from Google, Facebook, Harvard, and Stanford proposed a brand new blockchain technology based on their deep academic and engineering experience of multiple distributed systems. A flexible blockchain protocol based on trusted sharding becomes popular in media and attracts capital as people begin to realize that flexibility is the new scalability. For the vision of this innovative system, and to update the blockchain system from single-core to multiple-core, MultiVAC published three papers about their design and subsequently released three versions of their Testnet in order to test various capabilities and performance metrics. From 2019 to 2021, the team worked through both bull and bear markets, solved thousands of questions, and finally launched the Mainnet on June 26, 2021. # Testnet 1.0 ![](/files/vo1P25pEfq6qxivmWas4) # Testnet 2.0 ![](/files/3cdjsQjhqgNrYzpqjpio) # Testnet 3.0 ![](/files/AnqzKYAdiTGZKJc1hGHP) # Infrastructure Overview ![](/files/8BfAlXWxd1wz4QKGGGMm) # Technology Details Since the birth of MultiVAC, the dev team has published 3 papers on specific technology implementation, from basic concepts and frameworks to sharding implementation details and contract design models, comprehensively and completely discussing the overall design and implementation ideas. # The Whitepaper: Technical Overview {% embed url="" %} # The Yellowpaper: Sharding Details {% embed url="" %} # The Purplepaper: Contract Model {% embed url="" %} # Use MetaMask to Access MultiVAC Mainnet MetaMask, Mainnet, MTV **1. Click on the top of the MetaMask interface, as shown by the red circle.**
**2. Click "Add Network". If it is an old version of MetaMask, you may see "Custom RPC" instead. Click this button.** ![](/files/0RVlFrfeXh5H1R5OFAHN) **3. Fill in the following content on the pop-up page:** *Network Name:* MultiVAC Mainnet\ *New RPC URL:* \ *Chain ID:* 62621\ *Currency Symbol:* MTV\ *Block Explorer URL:* [https://e.mtv.ac](https://e.mtv.ac) Note: If your wallet requires you to fill in a hexadecimal value in the Chain ID column, please fill in ***0xF49D*** (not case sensitive). We also have an alternate RPC URL: , for European users, we recommend connecting to this RPC server. Here is another easy way by clicking the button on the right-bottom corner on [explorer](http://e.mtv.ac/): ![](/files/kCIbULkLoRVp833HYnNM) **4. Check the details on MultiVAC Mainnet:** ![](/files/HNaJoiLKqV1u3h02KFnk) # Check Information on Explorer Mainnet, Explorer The official blockchain explorer is . Here you can search addresses, transaction hashes, block hashes, and token names on the index page to check their details. ![](/files/tuub5ZGbRxVXVnLTBMpm) ### Block Info ![](/files/RGGistxmjPnn4CMHbcKW) ### Address Info ![](/files/bs4OfVQwIOTKlUTIzXnQ) ### Transaction Info ![](/files/xB0mtafnV08tQdCiXMnW) ### Token Info ![](/files/9sj8xkrnNhaVl7XJ6OHJ) # Deploy Smart Contracts on MultiVAC Smart Contracts {% embed url="" %} Links: [Remix](https://remix.ethereum.org/) [MultiVAC Explorer](https://e.mtv.ac/) Demo Code: ```solidity // SPDX-License-Identifier: MIT pragma solidity ^0.8.2; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; contract MRCTokenSample is ERC20{ constructor(string memory name_, string memory symbol_) ERC20(name_, symbol_) { _mint(msg.sender, 1000000000 * 10 ** decimals()); } } ``` # Connect to MultiVAC via Web3 Web3, MTV The MultiVAC mainnet supports EVM (Ethereum virtual machine), so you can use Ethereum's web3 tools to connect to MultiVAC. Web3 API docs: {% embed url="" %} Connect to MultiVAC Mainnet: ```javascript const web3 = new Web3('https://rpc.mtv.ac'); ``` Or you can use websocket: ```javascript const web3 = new Web3('https://websocket.mtv.ac'); ``` Get the number of the recent block: ```javascript web3.eth.getBlockNumber() .then(console.log); > 4475231 ``` Get account balance: ```javascript web3.eth.getBalance("0xB64BA36f4F8BC2AC451940e36f978A368C6B2d5A") .then(console.log); > "99844290333000000000" ``` Get a transaction: ```javascript web3.eth.getTransaction('0xdd7076df246df862f37538974acf4fd3a3bd535af7e9ec6991939da9ffc43908') .then(console.log); > { blockHash: "0x0814fbeeacee4b2ce0653e16a169acec9eacc08c94644d901c72ac5e50708642", blockNumber: 4465645, from: "0x00000df3e3e1f1b1212b8bdb8896df4442f13a4c", gas: 100000, gasPrice: 1000000000, hash: "0xdd7076df246df862f37538974acf4fd3a3bd535af7e9ec6991939da9ffc43908", input: "0x", nonce: 6950514, r: "0xf52dff98e28dc687b7cea0035bb6b69213453c63d293204cf854065890f7befb", s: "0x4a2e672ccdd9667f1bab500f8da4cf4b68c310832c22c5af272162a1a97e5f10", to: "0x147de9adb01dbbf567c5c97d6478a37b1a3236ca", transactionIndex: 5, type: "0x0", v: "0x1e95d", value: 2169045532468861238 } ``` Send a transaction: ```javascript // compiled solidity source code using https://remix.ethereum.org var code = 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// This is the code to deploy MRC20 token // using the callback web3.eth.sendTransaction({ from: '0xB64BA36f4F8BC2AC451940e36f978A368C6B2d5A', data: code // deploying a contract }, function(error, hash){ ... }); // using the promise web3.eth.sendTransaction({ from: '0xB64BA36f4F8BC2AC451940e36f978A368C6B2d5A', to: '0xB594c29B37c458DEC0Eb5a2ebe47b89b40bc16Fc', value: '1000000000000000' }) .then(function(receipt){ ... }); // using the event emitter web3.eth.sendTransaction({ from: '0xB64BA36f4F8BC2AC451940e36f978A368C6B2d5A', to: '0xB594c29B37c458DEC0Eb5a2ebe47b89b40bc16Fc', value: '1000000000000000' }) .on('transactionHash', function(hash){ ... }) .on('receipt', function(receipt){ ... }) .on('confirmation', function(confirmationNumber, receipt){ ... }) .on('error', console.error); // If a out of gas error, the second parameter is the receipt. ``` MultiVAC supports most of the Web3 interfaces. If you just deploy contracts, process transaction information, and send transactions, MultiVAC's web3 interface and return value are no different from Ethereum's. However, in the return value of Block information, the definition of some fields may be significantly different from Ethereum. Please see [this article](/api-differences-between-multivac-and-ethereum) for specific differences. # API Differences Between MultiVAC and Ethereum ETH, MTV Although MultiVAC and Ethereum can share many APIs, it should be noted that the underlying architecture of MultiVAC is very different from Ethereum. The bottom layer of MultiVAC implements full-dimensional sharding, so data processing, transmission, and storage are distributed, and a transaction may be processed across shards. Although MultiVAC fully supports EVM, developers can reuse most of the code under the ETH ecosystem and support web3 to access the MultiVAC Mainnet. However, it should be noted that due to the difference in the underlying architecture, MultiVAC may be completely different from Ethereum in part of the data structure. 1. At the level of smart contract development, Solidity is perfectly supported, and Remix can be used for development and deployment. 2. Cross-shard deployment of contracts is currently not supported. So you deploy and use contracts just like in Ethereum. In the future, MultiVAC will support cross-shard contracts, but only those contracts with very large numbers of users need to consider this issue. 3. The transaction data format of MultiVAC is completely consistent with Ethereum. 4. The Block data format of MultiVAC is highly similar to that of Ethereum, but not completely consistent. This is mainly reflected in: (a) The miner field in the block represents the information about the sharding and consensus settings. The smart contract does not need to care about the content, but it should be noted that the meaning of this field has changed. We named it miner to be consistent with the fields of Ethereum. (b) MultiVAC has no uncle blocks. Therefore, the sha3Uncles field represents the block miner and consensus data. The smart contract does not need to care about the content, but it should be noted that the meaning of this field has changed. We named sha3Uncles to keep it consistent with Ethereum's fields. The following figure shows the content of a block in MultiVAC. 5. In addition to these data fields in the Ethereum block, MultiVAC will also have some of its own data fields. But the developers of smart contracts can ignore them. These fields are only used by the bottom layer of MultiVAC. Web3 or go-ethereum will automatically ignore these unknown fields when parsing them. ![](/files/WYFGSyKyjMrPWMrnGHr9) # MultiVAC's Long-Term Vision The future of MultiVAC MultiVAC's vision is to enable large-scale commercial DApps to integrate smoothly into our ecosystem, enabling everyone to quickly and easily use blockchain applications to improve their work efficiency and quality of life, thereby creating a trustworthy, fair, and harmonious society. ![](/files/2w5bMQStF7YsWvsE2CmL) MultiVAC has strong underlying technology. MultiVAC can provide a lower-cost blockchain infrastructure and a transaction cost less than $0.00001, which allows it to act as a more efficient platform for DeFi and GameFi applications. In addition, MultiVAC can also be used in real industrial applications, such as supply chain management, logistics, medical information management, copyright management, etc.