Blockchain Demo

Made by Nawaf Alotaibi

Difficulty: 4

How Bitcoin works — at a glance

A very small, interactive explanation of the core ideas: transactions, blocks, hashing, proof‑of‑work, mining rewards (coinbase) and how copies of the ledger are compared between peers.

1 — Transaction
A signed transfer of value from A to B.
2 — Block
Many transactions bundled together with a nonce and a hash.
3 — Hash
Deterministic fingerprint — changing a block changes its hash.
4 — Proof‑of‑Work
Miners search for a nonce so the block hash meets a difficulty target.
5 — Coinbase
Special transaction that creates the miner reward included in a block.
6 — Consensus
Nodes compare chains and accept the longest valid chain.

Try a block See chain Coinbase

Visual chain (interactive)

nonce: 0

Tip: change difficulty or mine blocks below to see how hashes and validity change.

Difficulty

Add Transaction

Pending: 0

Chain validity

checking…

Pending Transactions

(none)

Blocks

Index

Hash

Nonce

Transactions

(no tx)

Balances (quick)

(no balances)

Public / Private Key Demo

Generate an ECDSA keypair, sign a message, and verify the signature.

This demo is a simplified React + Tailwind port of the original educational blockchain demo. It intentionally focuses on clarity over production security.

Mining estimates

digits	nonce	time estimate
4	500,000	15 minutes
5	8,000,000	4 hours
6	128,000,000	3 days
7	2,048,000,000	a month
8	32,768,000,000	2 years
9	524,288,000,000	30 years
10	8,388,608,000,000	481 years
11	134,217,728,000,000	7,690 years
12	2,147,483,648,000,000	123,036 years
13	34,359,738,368,000,000	1,968,581 years
14	549,755,813,888,000,000	31,497,291 years
15	8,796,093,022,208,000,000	503,956,662 years

In the production bitcoin blockchain, block 458,091 has the hash digest 00000000000000000000011246f099d94f91628d71c9d75ad2f9a06e2beb7e92. That's 21 zeros in a row! That one block would take this software approximately 8,454,989,768,407,765 years to mine.