Which is the earliest bitcoin wallet
a person signed by Nakamoto Tsui has put forward a revolutionary idea: let's create a currency that is not controlled by the government or anyone else! This idea is crazy: there is no asset support behind a string of figures, and no one is responsible for it. How can anyone accept it when you pay it to the other party as money
Merkle tree
looks like a binary tree, but this is the lower two nodes. Take the hash value to get the upper node. Just remember the root node to detect whether the whole tree has been tampered
the root hash value is stored in the block header, and the transaction process is stored in the block body. All nodes include block header and block body, but light nodes (such as bitcoin wallets on mobile phones) only include block header. This tree can prove that a transaction has been written into the blockchain
3. Consensus agreement
two issues should be paid attention to in decentralized currency:
1. Who can issue digital currency: mining
2. How to verify the legitimacy of transactions: blockchain
double spending attack
double spending attack is a major challenge of digital currency
all transactions in bitcoin have input and output. Where does bitcoin come from and where does it go
under normal circumstances, there may be two bifurcations, because two nodes obtain the bookkeeping right at the same time, and the two nodes package the block and calculate the random number at the same time. At this time, the two bifurcations will coexist temporarily until one of the blocks finds the next block first, which becomes the longest legal chain, and the other one is discarded<
Sybil attack
a malicious node keeps generating accounts. If the total number of accounts exceeds half of the total accounts, it obtains the control of the blockchain
consensus protocol in bitcoin
some nodes are malicious, and most nodes are good
idea 1: pack some transactions into blocks as candidate blocks, let each block vote, and write them into the blockchain if they pass
No, because some malicious nodes have been publishing blocks containing malicious transactions, and they have been voting and occupying resources. And some nodes don't vote<
idea 2: vote not by the number of accounts, but by computing power. Each node can generate legal transactions and put them into the block. These nodes start to try random numbers until H (block header) ≤ target is found, then this node has the right to account
the only way to generate bitcoin
coinbase transaction. There is no need to point out the source of the currency. If you have the bookkeeping right, you will get a reward< br />
50BTC-> 25BTC-> 12.5btc, the reward will be halved for every 210000 bitcoins
the process of bitcoin competing for bookkeeping rights is called mining. The node competing for bookkeeping right is called miner.
What are the wallets in our lives? Put your money, cards, and mobile phone, money and bank cards are issued by the bank. Mobile phone Alipay WeChat payment is paid through the third party, which is completely decentralized, and how it will be stored and retained? Besides being placed in the exchange, it can also be placed in the wallet. What are the types of bitcoin wallets? How to achieve point-to-point decentralization? Blockchain wallet is not used to hold money?! Have you stepped on thunder
miaozhou blockchain issue 08 can teach you to identify the mistakes of blockchain wallet. More blockchain beginners are welcome to pay attention to Babbitt's miaozhou blockchain
for example, European crowdfunding chooses to use blockchain technology to serve the real economy and crowdfunding through blockchain technology. Ethereum launched an intelligent contract system; Decent uses blockchain technology to protect intellectual property rights.
for the sake of wealth, businessmen, programmers and civil servants have all joined bitcoin crazily. Over the years, the price of bitcoin has gone through ups and downs. Some of them are already rich, while others end up in dismay among the earliest players of bitcoin in China, there is a legendary life of getting rich overnight, as well as a tragic story of family destruction. These stories bear witness to the development history of the coin circle
in fact, in my opinion, for bitcoin, the first batch may get up early and catch up late. Why do you say that< because over the years, people who can hold bitcoin are full of faith. Most of them came into contact with each other in the past 13 years. They were sold when the price rose to more than 7000, or got off ahead of time, or plummeted after the price rose. Now it's too late. The person who holds bitcoin for a long time is the one who forgets the private key of the wallet, which means that this part of the coin is lost and will never be taken back