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Signature of blockchain
Publish: 2021-05-10 12:55:25
1. blockchain has the following characteristics:
decentralization. Blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes information self verification, transmission and management through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain
openness. Blockchain technology is based on open source. In addition to the private information of all parties involved in the transaction is encrypted, the data of blockchain is open to everyone. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent
independence. Based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention
decentralization. Blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes information self verification, transmission and management through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain
openness. Blockchain technology is based on open source. In addition to the private information of all parties involved in the transaction is encrypted, the data of blockchain is open to everyone. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent
independence. Based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention
2.
in the distributed network of blockchain, the communication and trust between nodes need to rely on digital signature technology, which mainly realizes the identity confirmation and information authenticity and integrity verification
digital signature
digital signature (also known as public key digital signature, electronic signature) is a kind of common physical signature written on paper, but it uses the technology in the field of public key encryption to identify digital information. A digital signature usually defines two complementary operations, one for signature and the other for verification. Only the sender of information can proce a digital string which can not be forged by others. This digital string is also an effective proof of the authenticity of the information sent by the sender. Simply prove that "I am who I am."
3. [verify signature]
jump out of the verification interface, click the return button in the upper left corner, and then upgrade to the latest version to refresh the node. Or uninstall again and restore the account with mnemonics Refresh node] in free communication, the + sign in the upper right corner, "node detection & quot;
jump out of the verification interface, click the return button in the upper left corner, and then upgrade to the latest version to refresh the node. Or uninstall again and restore the account with mnemonics Refresh node] in free communication, the + sign in the upper right corner, "node detection & quot;
4. Block head, transaction details, transaction counter and block size... Are these Shenma things
blockchain is the big ledger of bitcoin network, and each block is equivalent to a page in the ledger. What information is recorded in the "account book"? At present, each block of bitcoin mainly records data such as block head, transaction details, transaction counter and block size
"block header" contains all information except transaction information, mainly including the hash value of the previous block header, which is used to ensure that blocks are connected in sequence; Time stamp: record the generation time of the block; Random number: that is, the answer to the arithmetic problem of PK for all miners in the whole network; Difficulty target: score the difficulty coefficient of the arithmetic problem
"transaction details" records in detail the transferor, income party, amount and digital signature of the transferor of each transaction, which is the main content of each block
"transaction counter" describes the number of transactions contained in each block
"block size" refers to the size of each block data. Currently, each block is limited to 1MB, which does not rule out the possibility of expansion in the future.
blockchain is the big ledger of bitcoin network, and each block is equivalent to a page in the ledger. What information is recorded in the "account book"? At present, each block of bitcoin mainly records data such as block head, transaction details, transaction counter and block size
"block header" contains all information except transaction information, mainly including the hash value of the previous block header, which is used to ensure that blocks are connected in sequence; Time stamp: record the generation time of the block; Random number: that is, the answer to the arithmetic problem of PK for all miners in the whole network; Difficulty target: score the difficulty coefficient of the arithmetic problem
"transaction details" records in detail the transferor, income party, amount and digital signature of the transferor of each transaction, which is the main content of each block
"transaction counter" describes the number of transactions contained in each block
"block size" refers to the size of each block data. Currently, each block is limited to 1MB, which does not rule out the possibility of expansion in the future.
5. First, you need to understand what "private key" and "public key" are and how they work
in order to ensure the data security of users, the blockchain system is implemented through a cryptographic algorithm. Specifically, it is implemented through a public cryptographic algorithm mechanism. We all know how a cryptographic algorithm can have a secret key, and the public secret key algorithm is a pair of (that is, two) secret keys, just like tiger amulet, which are used together. One is called public key, which can be disclosed to others. The private key should be kept by itself. In the blockchain system, the public key is used to identify the identity, and the private key is equivalent to the key to decrypt. But the difference is that a public key is only for a unique private key, that is to say, if you forget the private key, it will not be retrieved for you, In the blockchain system, it will not help you retrieve the private key, so you should keep the private key properly
in the blockchain system structure, the data encrypted with public key must be decrypted with the corresponding private key, while the data encrypted with private key
must be decrypted with the corresponding public key, so the data encrypted with private key (usually called "signature") must be decrypted with the corresponding public key, which can play a great role
for a simple example, if Zhang San wants to send a check to Li Si, how can it be sent? In the past, it would be taken by the bookkeeper, so Zhang San thought of a way. He encrypted the check with Li Si's public key, and then signed his name (signed with his private key). At this time, other people would not use it even if they got the check, because only Li Si had his private key, That is, only Li Si can use this check. This function design is called "script system" in the blockchain system
therefore, the private key encrypted by the blockchain digital signature cannot be decrypted by the original encrypted private key, but must be decrypted by the corresponding public key.
in order to ensure the data security of users, the blockchain system is implemented through a cryptographic algorithm. Specifically, it is implemented through a public cryptographic algorithm mechanism. We all know how a cryptographic algorithm can have a secret key, and the public secret key algorithm is a pair of (that is, two) secret keys, just like tiger amulet, which are used together. One is called public key, which can be disclosed to others. The private key should be kept by itself. In the blockchain system, the public key is used to identify the identity, and the private key is equivalent to the key to decrypt. But the difference is that a public key is only for a unique private key, that is to say, if you forget the private key, it will not be retrieved for you, In the blockchain system, it will not help you retrieve the private key, so you should keep the private key properly
in the blockchain system structure, the data encrypted with public key must be decrypted with the corresponding private key, while the data encrypted with private key
must be decrypted with the corresponding public key, so the data encrypted with private key (usually called "signature") must be decrypted with the corresponding public key, which can play a great role
for a simple example, if Zhang San wants to send a check to Li Si, how can it be sent? In the past, it would be taken by the bookkeeper, so Zhang San thought of a way. He encrypted the check with Li Si's public key, and then signed his name (signed with his private key). At this time, other people would not use it even if they got the check, because only Li Si had his private key, That is, only Li Si can use this check. This function design is called "script system" in the blockchain system
therefore, the private key encrypted by the blockchain digital signature cannot be decrypted by the original encrypted private key, but must be decrypted by the corresponding public key.
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