Bitcoi blockchains

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A block is just a collection of different edits to the list. A blockchain is just a group of blocks that are linked together. The very first edits to the bitcoin list were grouped together and placed in block 1. The next edits to the list were grouped and placed in block 2. I think you get the idea… The blockchain is how all bitcoin participants agree on what the correct version of names and balances is. The valid list is the blockchain! Remember from our technical lesson , in order to spend your bitcoin you need to reference a time in the past it was sent to you.

More specifically, you need to reference a previous time on the blockchain that it was sent to you. The blockchain is the ultimate authority on who owns what bitcoin at any given time. Mining involves solving a hard mathematical puzzle to create blocks, grouped sets of transactions that have been verified to be valid. A good overview for this process appears here , and a brief description follows. The miner selects a random group of unverified transactions that have been generated by users, as well as the solution to the preceding block.

The miner's computer will then do some math that involves searching for a random number to solve the puzzle. When a miner finds a solution, the miner conveys it to all other miners, who quickly verify the answer and agree that it is correct.

At this point, all the transactions that were included in that block are now cemented in time, and the miners start working on a new set of transactions, linking it to the newly minted block, and begin mining again. This mechanism links each new puzzle piece indelibly to the previous piece, and the chain continues for each new transaction set added to the chain.

As a result, every time a new puzzle piece is added, the transactions are cemented in time and their validity is verified by their connection to the preceding piece in the chain: evidence of what transaction occurred, who was involved, and when it occurred. In this environment, it is impossible to pretend that a transaction took place if it did not.

All parties involved are able to look at the transaction history and see that such a transaction never occurred. If a party tries to add a fraudulent transaction, the answer to the puzzle will be different from the correct answer, because the next puzzle piece can be linked only to the actual verified transaction; only the true transaction will be linked to the next puzzle piece.

If a malicious actor attempts to insert a new block in the chain, other miners will compare the fake block to their own copy of the blockchain and quickly recognize that the new block is fake. While Bitcoin is a simple implementation of a blockchain, it was the first real-world application of the technology. A message sent in Bitcoin is, literally, of the form, "give five of my Bitcoins to that person.

Exchanging Bitcoins by means of exchanging messages is what allows the exchange of money between two parties. Why Is Interest in Blockchain Exploding? While blockchain has gained significant popularity due to its role in cryptocurrency e. Fifty financial institutions have committed resources to blockchain-related research, dozens of healthcare companies have expressed interest in blockchain-based technologies, and consulting companies across the globe are helping their clients understand the promise that blockchain can hold for them.

This interest in blockchain technology stems from its four fundamental properties, all of which are highly attractive in many industries. Blockchain is Shared--Traditional databases are stored on a single server, which acts as a single point of failure.

Additionally, if the server gets overloaded, users can't query it for data in a timely manner. In the case of blockchain, multiple copies of the data are stored at many points throughout the network of participants, with participants each having a full copy of the entire ledger. As a result, the system more resilient to attack and disruption.

Authenticated--Every transaction on a blockchain is associated with an identity. This enables transparent audit trails, the ability to require specific types of content based on the user, and transaction authorization based on permissions. Auditable--The entire history of the blockchain is stored on multiple nodes and is easily viewable by an auditor, thus creating a highly transparent system.

Tamper-proof--The cryptographic underpinnings of blockchain technology make the system resistant to tampering with historical data. No single participant can affect the data, and advances are regularly being made to ensure that the data cannot be changed once logged. In short, blockchain provides a distributed, authenticated messaging system that tracks all events, is tamper resistant, and maintains a history. Such a system can be applied in a number of commercial settings. For example, within the financial industry, tracking transactions between parties is one of the primary purposes of a financial clearinghouse, which acts as an intermediary between parties in the transaction.

Blockchain technology shows significant promise in facilitating financial transactions, eliminating the intermediary and significantly reducing costs for everyone involved. Moreover, if the currency itself can be represented by the messages being passed around as it is in Bitcoin , then the blockchain becomes more than just a method for representing transactions; it becomes the currency itself.

Healthcare is awash with transactions that would benefit from inherently authenticated and tamper-proof messages, from prescriptions to procedure orders to medical records themselves. Two healthcare providers providing services to the same patient often need to share data about a patient, and this sharing still often takes place by means of the telephone or U.

Such transactions are insecure, slow, and unreliable. Some healthcare providers build an application program interface API that allows queries from authorized external parties, which is an improvement over telephone or mail, but the information remains controlled by the healthcare provider who generated it.

With blockchain, health records would be owned by the patient, and the patient would provide permission to any healthcare providers needing access to the records. Health records could then be distributed: every participant would store a full copy of the entire encrypted data set.

Rather than querying a remote server, healthcare providers would simply pull needed data from the chain. Should the patient begin seeing a new doctor, he or she would simply give the new doctor the appropriate permissions, and the doctor would then have access the patient's medical data.

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