The Alankrit Srivastava Blog

Tag: bitcoin vs ethereum

  • Day 8 — What If Money Could Follow Instructions?

    A smart contract running on a blockchain as a shared programmable agreement

    When money follows instructions

    Smart contracts make blockchain money programmable. They let value move only when certain rules are met.

    Bitcoin showed that money can move without a bank. Ethereum asked a bigger question. What if money could also follow logic?

    That idea turns a blockchain from a payment ledger into a shared computing platform.

    A simple example

    Imagine a small bet between two friends. A normal version needs trust. One person holds the money, or both trust a third person.

    A smart contract changes the setup. The rules can be written in code. Then the contract can release funds when the condition is met.

    In practice, real contracts need careful design. Still, the basic idea is simple. Rules can hold and move value.

    Why Ethereum matters here

    Ethereum was built for this broader kind of logic. It can store balances, run code, and update shared state.

    Because of that, developers can create tokens, lending apps, exchanges, games, and governance tools.

    However, the blockchain does not make every app safe. Bad code can still cause real losses.

    The trade-off

    Programmable money is powerful. It can remove some middlemen and create open financial tools.

    But it also adds complexity. Users must understand wallets, fees, approvals, and contract risk.

    Therefore, smart contracts are useful, but they are not magic.

    The takeaway

    A smart contract is a rule machine on a blockchain. It can hold assets and act when its conditions are met.

    That is the bridge from simple digital money to Web3 applications.

  • Day 7 — If a Few People Control Mining, Is Bitcoin Still Decentralized?

    What decentralization really means

    Bitcoin decentralization is not controlled by one single group. Miners matter, but they are not the whole story.

    Bitcoin also depends on nodes, users, developers, wallets, exchanges, and businesses. Each group plays a different role.

    So the better question is not whether Bitcoin is decentralized. The better question is which part of Bitcoin we are discussing.

    Miners have power, but not all power

    Miners create candidate blocks. They choose which valid transactions to include. They also compete for rewards.

    However, miners cannot simply change Bitcoin’s rules by themselves. If they create invalid blocks, nodes can reject them.

    This creates an important balance. Miners provide security, but nodes enforce validity.

    Why mining pools raise concerns

    Mining is expensive. Because of that, many miners join pools to make rewards more predictable.

    That can create visible concentration. A few pools may appear to control a large share of the hash rate.

    Still, a pool is not the same as one miner. Individual miners can leave a pool if it behaves badly.

    What a 51 percent attack means

    If one group controls most mining power, it could try to reorder recent transactions. It might also attempt double spending.

    However, it could not create coins from nothing. It also could not steal coins without valid signatures.

    Therefore, the risk is serious, but it has limits.

    The takeaway

    Bitcoin decentralization is a moving balance. Mining power, node rules, user choice, and economic incentives all matter.

    That is why decentralization is not a simple label. It is a system that must keep resisting control over time.