Yes address is a hash of the public key, its actually a dual hash of SHA256 and RIPEMD-160. You can check the steps outlined here:
https://en.bitcoin.it/wiki/Technical_background_of_version_1_Bitcoin_addresses#How_to_create_Bitcoin_Address
- Hash function is the function where each unique input creates a unique output. There is no way to go from output in to input again. If some one will figure out how to do it. It will broke bitcoin. Hash functions are very complexed
- In the cryptocurrency as bitcoin hash function are part of block hashing algorithm which is used to create the new transaction into the blockchain through the manning process.
- It means that it will hard to find 2 inputs that produce the same output
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A hash function is a cryptographic function which takes a single input and gives a single and unique output of a fixed length. The cryptographic part is used to obscure the input.
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Hashing is used for bitcoin mining. The miner must brute force an input that matches the output of the block to be rewarded.
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Collision resistance means no two inputs have the same output.
Hash functions generate unique digital fingerprints from a specific input. The hash function will create a different output for every different input and the same output if the same input is entered into the function.
Hash functions are used in bitcoin mining as complex computational puzzles that miners must solve in order to verify transactions and earn/mine bitcoin rewards. These complex puzzles require extensive computational power as resources and the solutions generated by the resources are the āproof of workā that is required to mine bitcoin.
Collision resistant means that a hash function should never generate the same output/digest for any two different inputs.
- Hash function algorithm is designed to produce a unique fingerprint for an input.
- In cryptocurrencies hash functions used to compute one-way fingerprint for every single transaction.
- It means that hash function must not produce identical fingerprint for two different inputs. For example, for two different inputs āaā and ābā output must never equal to ā1235ā. It must always produce different output.
1.- It is a mathematical process that gets an input, performs operations on it and returns an output.
2.- Hash functions are used in bitcoin in the block hashing algorithm, which is used to write new transactions into the blockchain through the mining process.
3.- Refers to the collisions in hash functions, that are two inputs that produce the same output; the harder it is to find a pair of inputs that produces the same output the stronger the collision resistance.
Brute force is not the same as mining. With brute force you are trying to find the exact same hash while in mining miners are searching for a new hash below a certain target.
- A hash function is an elaborate code (fingerprint) that is generated from an input. If one small piece of the input is changed (however minimal) the output code would be completely different. This makes it fool proof and tamper resistance.
- Hash functions are used in BTC to verify the transactions. It is the backbone of the BTC network.
- In BTC hash functions must be collision resistant which in simple terms means that it should be as near to impossible as possible for two inputs to equal the same output (code). If different inputs were to accidentally produce the same output this would be very problematic for BTC.
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A hash function is a one-way cryptographic function. Note: It is not an encryption, as the original data, or input, canāt be decrypted.
And hashing is the process of a hash function receiving input (Digits, Letters, or Media Files) which it then turns into a fixed, cryptographic output.
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So, letās imagine: A new fixed, cryptographic output is being added to a blockchain in the form of a block.
This new block needs to have the hash of the previous block which matches with the new hash, The hashes always need to match.
If the donāt match, the transaction will not be accepted (no consensus), which effectively makes the blockchain technology immutable.
The aspect of immutability increases or strengthens in proportion to the amount of computers/nodes that are part of the decentralized, blockchain network.
So, the larger a blockchain network, the harder it is to hack.
3.
Collision resistance is a property of a hash function.
For a hash function to be collision resistant, it needs to have a low probability of 2 different inputs producing the same output.
- Describe hash functions with your own words
Hash functions are one way functions that will give you a unique output (digital fingerprint) for each unique input.
- How are hash functions used in cryptocurrencies like bitcoin? (Try to research this on your own, we will cover this later in the course but challenge yourself and see if you can find information on this already now).
In bitcoin, hash functions are part of the block hashing algorithm, used to mine new coins. It is also used to secure new transactions in the blockchain using SHA-256. The more blocks that have been hashed onto each other to build the chain, the more secure the blockchain becomes.
- What does it mean when we say that hash functions need to be collision resistant? (We didnāt use the term ācollision resistantā in the lecture, but you will easily find this on Google, we add this question intentionally to make you research information on your own, thatās how you learn best).
For hash functions to be collision resistant means that they will not produce the same outcome (digital fingerprints) for two different unique inputs. The chance of this happening in the real world is so small , due to the amount of possible unique outcomes (digital fingerprints).
1. Describe hash functions with your own words
Hash functions are high complex equations, deliviring a unique output for each unique input. They are that complex, no one can simply execute them backwars to get the input.
2. How are hash functions used in cryptocurrencies like bitcoin?
In Bitcoin each Block is signed with a unique hash as a result of the unique data inside the block. The single blocks are connected by the hashes. If someone tries to change just a little piece of data inside a block, this will result in a complete different hash and a fork away from the main chain.
3. What does it mean when we say that hash functions need to be collision resistant?
A collision in hash functions is, when two different inputs result in the same output. A collsions is quite uncommon but not impossible. So for a reliable process hash functions need to be collision resistant.
- It is a unidirectional input to output fingerprint. It is repeatable given that the input is exactly the same. However, you cannot recover the input from the output. It is essentially used as a data integrity check.
- Hash functions are used to write new transactions, derive public keys to block signatures and verifying if a transaction can be spent.
- Collision resistant means it is highly unlikely that you will get the same hash output from different inputs
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A hashing function will turn raw data/information into a string of numbers (1-9) and letters (a-f). It will turn data into a digital fingerprint, irreversibly.
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Hash functions are used to write new transactions into the blockchain via mining process. In this case, the inputs involved are the transactions sent over the bitcoin network.
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Collision resistance is an inherent property of hash functions. It means that it is almost impossible to find two inputs that hash to the output.
1- Hash functions are one way functions where each input have a unique output, that is a unique digital fingerprint. You can go input to output, but NEVER output to input.
2- Hash functions are used in mining by creating this unique fingerprint united from this specifical data. Can be transactions, data, public o private keys.
3- Collision is having two diferent inputs providing the same output. Any hash function with more inputs than outputs will necessarily have such collisions. The harder they are to find, the more cryptographically secure the hash function is.
SHA256 is not used to derive public keys, for that the Elliptic curve function is used.
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The outcome of a the fuction is called a hash.So when we input some informations (words) the hash fuction is giving as fixe-size values coming from this inputs.
Bitcoin use the SHA-256 hash algorithm to solve a block and secure that this cannot be duplicated so any decimal of coin beeing āminedā by that is unique.
- A function is collision resistance when it is hard to find two inputs that hash to the same output.
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Describe hash functions with your own words
HF is a function where an input produces a specific output. However, given that output, you cannot determine the corresponding input. As a result, these are called one-way functions. -
How are hash functions used in cryptocurrencies like bitcoin? (Try to research this on your own, we will cover this later in the course but challenge yourself and see if you can find information on this already now).
When you are sending a message, you need to cryptographically change that message so that it cannot be replicated by someone else. In order to change the message we change the digital signature. Within the digital signature, we cryptographically change the private key. -
What does it mean when we say that hash functions need to be collision resistant? (We didnāt use the term ācollision resistantā in the lecture, but you will easily find this on Google, we add this question intentionally to make you research information on your own, thatās how you learn best).
The hash functions need a unique output for each input. If two different inputs create the same output, then the function is not as secure.
- Hash function is unique identifier of a content and also irreversible process that converts data into cyphertext of a specific size.
- Hash function guarantees immutability- one of the most important blockchain features. Each block that is mined has its own hash that is time stamped an also has details of the hash of the previous one hence they form a chain that is currently impossible to alter.
- Collision resistance is one of the main requirements for hash function. Two different messages should not be able to produce the same hash value
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Describe hash functions with your own words
Hash functions are mathematical equations which output a unique code depending on the input. Files of any type or size can be fed into them, and if one small thing changes leading to just one binary digit to be different, the output will completely change. Also, importantly, they cannot be reverse engineered - you cannot take the output and figure out the input. -
How are hash functions used in cryptocurrencies like bitcoin? (Try to research this on your own, we will cover this later in the course but challenge yourself and see if you can find information on this already now).
Hash functions are used in Bitcoin to write new transactions into the blockchain. The inputs are new, unconfirmed transactions (plus data on timestamp and a reference to the previous block). Miners combine all of the inputs with their own arbitrary piece of input data (called a nonce) in such a way that the resulting hash starts with a certain number of zeroes, at which point a new block has been solved and gets added o the blockchain.
This takes a huge amount of computational power, meaning the combined processing power of all the computers in the network still takes around 10 minutes to solve a block. This need for a large amount of processing power is what keeps new Bitcoin being mined gradually (not to mention the halvings, of course).
- What does it mean when we say that hash functions need to be collision resistant? (We didnāt use the term ācollision resistantā in the lecture, but you will easily find this on Google, we add this question intentionally to make you research information on your own, thatās how you learn best).
Collision resistance means that two inputs cannot hash to the same output, and that the function is unidirectional and cannot be reverse engineered.
1.) hash functions takes any size form af raw data and converts it into an alphanumeric string.
2.) Btc hash functions input all the raw transaction data regardless of size and crunch it into a unique numeric stream based on a specific set of parameters.
3.) In cryptography a Hash function is collision resistant if it is hard to find two inputs that hash to the same output; i.e. two inputs a and b where a ā b but H(a) = H(b).