区块链id是什么意思,区块链交易id

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㈠What are the six basic functions of ERC20 tokens

In order to create an ERC20 token, you need to write down the following

Token name Token symbol Token decimal place Token quantity is the circulation contract code Verification source code By the way, ERC721 is a protocol mainly used for blockchain games. The blockchain games that you often see are basically based on ERC721.

㈡ How do you view Alipay’s involvement in the blockchain field and the recent launch of nft?

It should be that they are adjusting their business and trying to keep up with the times, and they cannot hinder the country’s development to make everyone’s life more convenient.

㈢ How to get started with blockchain. This knowledge is not difficult to learn.

1. To learn blockchain knowledge, first learn the necessary concepts of blockchain knowledge.

2. [Blockchain]

The English name blockchain is the underlying technology of Bitcoin and a decentralized accounting method.

3. [Block and Chain]

Block refers to the information block that records transaction information. Each block contains three main factors: The ID of the block, the odd number of the transaction, and the ID of the previous block.

The Bitcoin system generates a block approximately every 10 minutes. Each block contains the ID of the previous block, making the blocks form a complete transaction chain. The longest one is The only master blockchain.

4. [Bitcoin]

Bitcoin is a practical application of blockchain technology. It is a peer-to-peer electronic cash payment system that first existed as a virtual currency. , Japan has recognized the legality of Bitcoin and can use Bitcoin for shopping.

5. [Satoshi Nakamoto]

The legendary founder of Bitcoin published a paper on a peer-to-peer electronic cash system in 2008, marking the The birth of Bitcoin.

6. [Digital Currency]

It is completely different from the Q coins and other virtual currencies we use to play games in real life. For example, in Japan, although Bitcoin is a digital currency , but it can already be used to purchase goods in real scenarios.

7. [PoW]

A type of consensus mechanism, also known as proof of work. Bitcoin currently uses this consensus mechanism. It is relatively simple and easy to reach consensus, but consumes huge amounts of energy and is prone to bifurcation.

8. [PoS]

A type of consensus mechanism, also known as proof of equity. People with greater rights and interests have a higher probability of becoming a bookkeeper, but the bookkeeper is not necessarily professional. It doesn’t use much electricity and is easy to split.

9. [DpoS]

On the basis of PoS, the bookkeepers are changed from unprofessional to professionals, like the EOS we are familiar with. In this consensus method, holders jointly select 21 nodes and 100 reserve nodes to reach consensus on the EOS constitution, and jointly incubate the ecology on EOS.

10. [Public key and private key]

In the world of blockchain, the public key is equivalent to the bank account number, and the private key is equivalent to the bank account number + withdrawal password. The private key is essentially an array of 32 bytes. The private key can generate the public key and address, but this behavior is irreversible, so it is crucial to keep the private key. Losing the private key is equivalent to losing money. And it can never be found back.

11. [Hash value]

It can be simply thought of as a set of data that is closely arranged together. No item in the data can be changed, otherwise The calculated consequences will be very different.

12. [Smart Contract]

It is a commitment in digital form. Both parties involved can execute these commitments on the network without artificial restrictions.

13. [Credit Consensus]

Based on the characteristics of blockchain, it is a distributed accounting method that cannot be tampered with and is irreversible. A mechanism of trust that allows many people to form a trust based on digital algorithms.

14. [Public chain and private chain]

Public chain refers to a blockchain that can be participated in and read by people all over the world, and is open to everyone , while the private chain is only in the hands of an organization and is only open to individuals or entities.

Blockchain is currently a hot topic. Many traditional large enterprises and venture capital are actively participating in the layout and investment of the blockchain industry. As the general public, we must master the necessary blockchain knowledge. , helps us judge and analyze real-world information and protect our investments.

㈣ What are the main data security measures of the supply chain blockchain?

The main data security measures include identity authentication, access control, data encryption, data backup, etc.

㈤ Can the blockchain transaction ID be given to others?

No
The blockchain transaction ID involves personal privacy and important personal data. Do not leak it easily to prevent important personal data. lost.
Blockchain transaction ID, also called transaction hash, is a string ofThe character calculated by the size, time, type, creator, machine, etc. of each Bitcoin transaction is equivalent to the identity certificate (ID) of each Bitcoin transaction, which is unique and unchangeable.

㈥ What is NFT and what are the NFT trading platforms?

NFT is the abbreviation of Non-Fungible Tokens, which means non-fungible tokens, which is relative to interchangeable In terms of tokens. Non-fungible tokens are also called non-fungible tokens.
What are fungible tokens? For example, tokens such as BTC and ETH are homogeneous tokens, so they are interchangeable with each other. In other words, your ETH and my ETH are essentially the same and have the same attributes. ,price. Non-fungible tokens, or non-fungible tokens, are unique, just like works of art, each one is different. They are not interchangeable, so they are called non-fungible tokens or non-fungible tokens.
Unlike BTC and ETH, which can be divided into 0.1 or 0.0002, the unit of NFT is always 1. The typical characteristics of NFT are uniqueness and scarcity.
The NFT market has begun to attract attention in the crypto field, mainly starting with CryptoKitties. Cryptokitties in 2017, as the first phenomenal encryption game application, took the lead in bringing NFT into the public eye. Each cryptokitty corresponds to an NFT token on the chain and has a unique ID and gene. The genes of different cats are different. After the combination, the cats represented by the new NFT tokens were auctioned on the market, and the most expensive cat sold for a sky-high price of hundreds of thousands.
NFT became popular due to Ethereum Cat in 2017, which created the protocol ERC721 on Ethereum, which is called the first NFT standard on Ethereum.

OpenSea: Founded in 2018, it is a global digital item buying and selling market based on blockchain. OpenSea is positioned as the industry's leading decentralized exchange (Decentralized Exchange, DEX), providing peer-to-peer Ethereum Fungible Token (NFT) transactions.

Nifty Gateway: is a regulated, non-fungible token (NFT) currency market that leverages Gemini’s back-end infrastructure to build a U.S. dollar exchange platform. On the platform, users can purchase NFTs with a credit card, which can then be cashed out directly into a bank account when sold.

MakersPlace: Launched in 2016, it is a full-service platform for artists and creators based on blockchain technology to mint NFTs representing their work. With blockchain technology, every digital creation a collector obtains through MakersPlace is a unique digital creation signed and issued by the creator.

Rarible: It is an NFT issuance and trading platform that creates and sells digital collections protected by blockchain. The platform is an open source, non-custodial platform for users to mint, sell and create collectibles. Any user can enter Rarible to create and display their own art, or use Ethereum tokens to purchase art for collection.

SuperRare: Founded in 2017, it is known as the Internet digital art market with a global network of digital artists, with nearly 700 artists. Super Rare is based on blockchain technology and follows the ERC721 standard. The entire history and origin of the artwork can be traced on the distributed ledger, and no one can cheat.

VIV3: Just released this year, it is the first comprehensive market on the Flow public chain. VIV3 was founded as the beginning of a shift from physical to digital ownership to enable one billion people to create, trade and own the world's most valuable works. Flow is a highly scalable, composable smart contract platform that delivers the performance required for mainstream applications without compromising decentralization.

㈦ Blockchain---FT, NFT, ERC-20 protocol and ERC-721 protocol

FT is a homogeneous token, and homogeneous cryptocurrency constitutes Most of the tokens currently on the market.

FT is a digital asset configured in such a way that each token (or fragment of a token) is equivalent to the next token.

Fungibility is a characteristic of fiat currencies. For example, a $20 bill can be exchanged for any other $20 bill, or even for fractions. Even if it's not an absolute $20 bill, it can be a multiple of a $5 bill, or even less, so the total is equal to $20.

NFT refers to non-fungible tokens. Non-fungible tokens usually refer to tokens issued by developers on the Ethereum platform in accordance with the ERC-721 standard/protocol. Used to describe a unique digital asset whose ownership can be traced on the blockchain.

NFT is a unique and indivisible token. All works of art, whether it is books, text, music or images... and other forms, even digital collectibles and online games can be used Verify its unique and rare value through NFT's special certification method.

Therefore, NFT has different characteristics compared with collectibles in the traditional economic system:

Official documentation address: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md

ERC20 standard is a token protocol on Ethereum. All token contracts developed based on Ethereum comply with this protocol.

Account A has 1,000 ETH and wants to allow account B to call 100 ETH at will.

Official documentation: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md

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ERC-721 is compatible with some features of ERC-20. The main difference from ERC-20 is that it defines the owner of the token, that is, each token records the owner of its history in detail, and defines the Metadata of the token. , which is metadata. ERC-721 also needs to implement the interface in ERC165.

Metadata is used to define the unique characteristics of a single token and provide descriptive information for a specific token ID. . Take CryptoKitties as an example. Each CryptoKitty has a different color, shape, name, etc.

• tokenId: the unique NFT ID within the contract, which cannot be changed during the life cycle of the NFT (to be implemented The only tuple in the whole chain that must be composed of (contractAddr, tokenId))

• name: name, similar to the name of ERC-20

• symbol: symbol, similar to ERC -20 symbol

• uri: a link to external information, usually a JSON, and there is further more specific information in JSON

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㈧ Where to check the blockchain transaction ID

Here we use the wallet of the Ethereum blockchain as an example, little fox It is an encrypted wallet and the entrance and exit to the blockchain APP. After entering, obtain the wallet address, and then use the searcher of the Ethereum blockchain to enterAfter entering the homepage of the Etherscan official website, you can obtain the following blockchain transaction ID information:
1. The latest block
2. The latest transaction
Extended information:
Blockchain The transaction process seems mysterious and cumbersome, but in fact it is not necessarily that difficult to talk about.
Step 1: Owner A uses his private key to sign a digital signature on the previous transaction (bitcoin source) and the next owner B, and appends this signature to the end of the currency to create Transaction order. At this time, B uses the public key as the recipient address.
Step 2: A broadcasts the transaction order to the entire network, and the Bitcoin is sent to B. Each node will receive the transaction information and include it in a block
At this time, for B, the Bitcoins will appear in your Bitcoin wallet immediately, but cannot be used until the block is confirmed. At present, a Bitcoin can only be truly confirmed after being confirmed by 6 blocks from payment to final confirmation.
The third step: Each node obtains the right to create a new block by solving a mathematical problem, and strives to be rewarded with Bitcoins (new Bitcoins will be generated in the process)
At this time, the nodes repeat Try to find a value so that after feeding the three parts of the value, the Hash value of the last block in the blockchain, and the transaction order into the SHA256 algorithm, the hash value are all 0), that is, the solution to the mathematical problem is found.
Step 4: When a node finds a solution, it broadcasts all timestamped transactions recorded in the block to the whole country, and is checked by other nodes in the entire network.
At this time, the timestamp is used to prove that a specific block must indeed exist at a specific time. The Bitcoin network obtains the time from more than 5 nodes, and then takes the middle value to become a timestamp.
Step 5: Other nodes in the entire network check the correctness of the accounting of the block. If there are no errors, they will compete for the next block after the legal block, thus forming a legal accounting blockchain.