What are Distributed Ledger, Smart Contract & Bitcoins?

Smart Contracts: – The blocks in a Blockchain are written only on consensus, and one way of achieving the agreement is through smart contract.  A Smart contract is a set of computer instruction (code) that all the participants must agree. Whenever a block is written into the Blockchain, the code validates the data against the agreement, and on successful validation of data it is converted into a block and written into the Blockchain. All the participants in the network then update their Blockchain.  The code follows a very simple rule ‘if this then does that.’  Smart contracts are pre-written computer code, they are stored and replicated across all the participants in the Blockchain network, and they are executed on all the nodes when a block must be written into the data.  The result of executing the smart contract is usually writing of the block into the Blockchain.  When a block is written into the ledger, the participant that helped with validating the block and writing the block into the ledger is rewarded with a Bitcoin.

Definition from BlockChainTechnologies.com explains that, “Smart Contract (also called self-executing contracts, Blockchain contracts, or digital contracts) are simply computer programs that act as agreements where the terms of the agreement can be preprogrammed with the ability to self-execute and self-enforce itself. The main goal of a smart contract is to enable two anonymous parties to trade and do business with each other, usually over the internet, without the need for a middleman. The origin and history of smart contracts are much older than bitcoin and dates to the 1990’s. The term ‘smart contract’ was first coined in 1993 by one of bitcoin’s alleged creators, Nick Szabo, and referred to self-automated computer programs that can carry out the terms of any contract.”

Bitcoins: – Any participant on the Blockchain network who provide processing power to validate and record transactions into the Blockchain is a potential ‘miner’ and as a reward gets bitcoins.  The bitcoins are only virtual; there are no physical or digital coins.  The bitcoins are stored in a digital wallet, and the owner has the key to the digital wallet.

Every four years the number of bitcoins created are halved and currently has a higher limit of 21Million bitcoins.  There are no clear reasons why a 21Million restriction (the currency is infinitely divisible, and only an upper limit is set), but the closest explanation is that initially, 50 bitcoins would was rewarded to the first participant who writes into the Blockchain and subsequently halved every four years.  i.e., 50 bitcoins in the first four years, 25 coins in the second four years and so on..

• Total Blocks in an hour @ 1 block every 10 minutes = 6 Blocks
• Total Blocks in a day = 6Blocks * 24 = 144 Blocks
• Total Blocks in a year = 365 * 144 = 52,560 Blocks
• Total Blocks in four years = 210,240 Blocks
• Total Blocks = 210240 * (Total Number of Bitcoins every four years)
• Since bitcoins reduces by half every four years – 50+25+12.5+6.25+… = 50/(1-0.5) = 100 (by geometric series)
• Total Bitcoins that would be possible = 210240 * (100) = Almost 21Million

From the above logic, it is not clear why the assumption on only six transactions a minute, 50 bitcoins for a block being written and bitcoins being halved every four years were made, and, if any of these assumptions, will cause a Y2K kind of issue.

However, Bitcoin is a distributed computing innovation and the name of the protocol.  Bitcoin is the network.  Bitcoin currency is the first application of Blockchain.

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