Bitcoin

May 17, 2026 - By Administrator

Bitcoin: A Complete Overview

What is Bitcoin?
Bitcoin (BTC) is the first decentralized cryptocurrency, created in 2008 by an anonymous person or group using the pseudonym **Satoshi Nakamoto**. It launched on January 3, 2009, with the mining of the “Genesis Block.” Bitcoin is a peer-to-peer digital currency that operates without a central authority, bank, or government.

Origins and History

– **October 31, 2008**: Satoshi published the whitepaper *”Bitcoin: A Peer-to-Peer Electronic Cash System”* on a cryptography mailing list.
– **January 3, 2009**: The Genesis Block (Block 0) was mined, containing the famous embedded message: *”The Times 03/Jan/2009 Chancellor on brink of second bailout for banks.”*
– **May 22, 2010**: “Bitcoin Pizza Day” — Laszlo Hanyecz paid 10,000 BTC for two pizzas, the first known commercial transaction.
– **2011**: Satoshi disappeared from the community.
– **2017**: First major bull run; BTC hit ~$20,000.
– **2021**: All-time high near $69,000; El Salvador adopted BTC as legal tender.
– **January 2024**: U.S. SEC approved spot Bitcoin ETFs.
– **April 2024**: Fourth halving event reduced block rewards to 3.125 BTC.
– **2025**: BTC surpassed $100,000 amid institutional adoption.

How Bitcoin Works

### Blockchain
Bitcoin uses a **public ledger** called the blockchain — a chain of cryptographically linked blocks containing transaction data. Every node on the network maintains a copy.

### Proof of Work (PoW)
Miners compete to solve complex cryptographic puzzles (SHA-256 hashing). The winner adds the next block and receives:
– **Block reward** (newly minted BTC)
– **Transaction fees**

### Halving
Every 210,000 blocks (~4 years), the block reward is cut in half:
– 2009: 50 BTC
– 2012: 25 BTC
– 2016: 12.5 BTC
– 2020: 6.25 BTC
– 2024: 3.125 BTC
– ~2028: 1.5625 BTC

### Supply Cap
Bitcoin has a hard cap of **21 million coins**. The last BTC will be mined around the year **2140**. Roughly 19.7 million are already in circulation as of 2026.

## Key Technical Features

– **Hashing algorithm**: SHA-256
– **Block time**: ~10 minutes
– **Block size**: ~1 MB base (up to ~4 MB with SegWit)
– **Difficulty adjustment**: Every 2016 blocks (~2 weeks)
– **Addresses**: Legacy (1…), SegWit (3…), Native SegWit/Bech32 (bc1…), Taproot (bc1p…)

Wallets and Keys

– **Private key**: Secret string that controls funds — “not your keys, not your coins.”
– **Public key/address**: Derived from private key; used to receive BTC.
– **Wallet types**:
– **Hot wallets**: Software wallets (Electrum, Sparrow, mobile apps)
– **Cold wallets**: Hardware (Ledger, Trezor, Coldcard) or paper wallets
– **Custodial**: Exchanges hold your keys (Coinbase, Binance, Kraken)

Mining
Originally done on CPUs, then GPUs, then FPGAs, and now **ASICs** (Application-Specific Integrated Circuits). Major mining pools include Foundry USA, Antpool, F2Pool, and ViaBTC. The U.S. became the dominant mining hub after China’s 2021 ban.

## Layer 2 and Scaling

– **Lightning Network**: Off-chain payment channels for instant, low-fee microtransactions.
– **SegWit (2017)**: Separated signature data to increase capacity.
– **Taproot (2021)**: Improved privacy and smart contract flexibility via Schnorr signatures.
– **Ordinals/Inscriptions (2023)**: Allowed NFT-like data on Bitcoin.

Economic Properties
– **Deflationary**: Fixed supply, decreasing issuance.
– **Divisibility**: 1 BTC = 100,000,000 satoshis (“sats”).
– **Censorship-resistant**: No entity can freeze or reverse transactions.
– **Pseudonymous**: Addresses aren’t tied to identities but transactions are public.

Use Cases
– Store of value (“digital gold”)
– Cross-border remittances
– Hedge against inflation/currency debasement
– Payment rail (especially via Lightning)
– Treasury reserve asset (MicroStrategy, Tesla, nation-states)

## Criticisms and Risks

– **Energy consumption**: Bitcoin mining consumes roughly as much electricity as a mid-sized country.
– **Volatility**: Prices can swing dramatically.
– **Regulatory risk**: Different countries treat it differently (banned in China, legal tender in El Salvador).
– **Scalability**: Base layer handles only ~7 transactions per second.
– **Loss risk**: Lost private keys = lost coins forever (estimated 3-4 million BTC are lost permanently).
– **Quantum computing**: Long-term theoretical threat to cryptographic security.

## Notable Figures

– **Satoshi Nakamoto**: Anonymous creator, holds ~1 million BTC (untouched).
– **Hal Finney**: Received the first BTC transaction from Satoshi.
– **Michael Saylor**: MicroStrategy CEO, major institutional advocate.
– **Adam Back**: Hashcash inventor, cited in the whitepaper, CEO of Blockstream.
– **Roger Ver,

# Bitcoin Halving: A Deep Dive

Since your previous question covered Bitcoin broadly and the halving is one of its most important mechanisms, here’s a detailed breakdown.

## What Halving Actually Is

A Bitcoin halving is a pre-programmed event that occurs every **210,000 blocks** (roughly every four years) where the block reward paid to miners is cut in half.^1^ ^2^ This is the core mechanism enforcing Bitcoin’s fixed 21 million supply cap, and it will continue for **32 total cycles** until rewards effectively reach zero around the year **2140**.^1^

## Complete Halving History

| Halving | Date | Block Height | Reward Before | Reward After |
|———|——|————–|—————|————–|
| 1st | Nov 2012 | 210,000 | 50 BTC | 25 BTC |
| 2nd | Jul 2016 | 420,000 | 25 BTC | 12.5 BTC |
| 3rd | May 2020 | 630,000 | 12.5 BTC | 6.25 BTC |
| 4th | Apr 2024 | 840,000 | 6.25 BTC | 3.125 BTC |
| 5th | ~Apr 2028 | 1,050,000 | 3.125 BTC | 1.5625 BTC |

The fourth halving occurred on **April 20, 2024** at block height 840,000.^3^ The next halving is expected around April 2028 — as of late 2025, roughly 120,870 blocks remained.^1^

## The 2024 Halving in Detail

### Supply Impact
After April 2024, daily new issuance dropped mathematically from approximately **900 BTC/day to about 450 BTC/day**, based on the 3.125 BTC subsidy and ~10-minute block times.^4^ ^5^ Annualized, that’s roughly **164,250 new BTC per year**.^5^

This dropped Bitcoin’s annual supply inflation rate to about **0.83%** — lower than gold’s roughly 2% inflation rate.^4^

### Circulating Supply
As of late 2024, approximately **19.7 million BTC** had been mined, meaning **over 93.8%** of all Bitcoin that will ever exist is already in circulation.^4^ By the 2028 halving, that figure will exceed **96.8%**.^3^

### Price Performance Post-Halving
– Halving-day price (April 19, 2024): **~$63,762**^6^
– One year later (April 15, 2025): **~$83,671** (+31%)^6^
– Subsequent rally pushed BTC above **$100,000**^6^
– October 2025 peak: approximately **$126,200**^7^
– Early 2026: trading roughly **50% below** the October 2025 peak^7^

Notably, the 2024 cycle has been atypical — the price momentum that historically materializes around nine months post-halving was largely absent, coinciding with Q1 2025 macroeconomic uncertainty and global trade tensions.^8^

### Market Dominance
Bitcoin dominance (excluding stablecoins) rose to **72.4% by May 2025** — an eight-year high.^6^ While BTC dominance grew **+13%** post-halving, Ethereum’s dominance fell **-56%** and Solana’s fell **-25%** over the same period.^6^

## Miner Economics Post-Halving

### The Squeeze
When the subsidy halved, miners’ guaranteed per-block revenue was cut in half overnight.^3^ **Hash price** (expected return per hash) has fallen roughly **60% since April 2024**.^6^ Despite this, the network hashrate kept climbing, with projections of **650–700 EH/s** by year-end.^7^

### Fee Spikes Around the Event
Immediately after the halving, fees spiked dramatically — **$146 for medium-priority and $170 for high-priority transactions**.^9^ Some blocks mined during the halving event and the **Runes protocol launch** contained fees exceeding **10 BTC** — more than triple the 3.125 BTC subsidy itself.^3^

### Fee Reality Since
The fee bonanza didn’t last. In the year following the 2024 halving, only about **8,000 BTC** were paid in transaction fees — a steep drop compared to **37,000 BTC** during the first year after the 2020 halving.^8^ This has put pressure on miners who were counting on fee revenue to offset the subsidy reduction.

## The Long-Term Transition

Bitcoin’s design intentionally shifts network security funding from **block subsidies** (newly minted BTC) to **transaction fees** over time.^4^ ^10^ After the last BTC is mined around 2140, miners will rely entirely on fees to secure the network.^1^ ^10^

Importantly, unlike traditional monetary policy, **these supply changes are mathematically locked and irreversible** — there’s no mechanism to accelerate issuance during demand surges or slow it during downturns.^4^

## Why It Matters

1. **Predictable scarcity**: Unlike fiat, the issuance schedule is fully transparent and immutable.
2. **Stock-to-flow effect**: Each halving doubles Bitcoin’s stock-to-flow ratio, historically correlated (though not guaranteed) with price appreciation.
3. **Mining shakeouts**: Less efficient miners go offline post-halving, consolidating the industry toward operators with cheap power and modern ASICs.
4. **Diminishing absolute impact**: Each halving removes a smaller absolute amount of new supply, but the proportional signal remains significant.^4^

—

Want me to go deeper into a specific aspect — for example, the mining industry post-halving, the price/halving cycle theory, or how Bitcoin’s security budget evolves long

# The Bitcoin Halving Cycle Theory: Price, Patterns, and Predictions

Since “more detail” is open-ended, I’ll dive into the most discussed angle of the halving: **the four-year cycle theory** — the patterns, the models, the critiques, and why the 2024 cycle has broken with tradition.

## The Classic Four-Year Cycle

The “Bitcoin cycle” refers to a repeating ~4-year pattern that roughly aligns with halving events. The traditional structure looks like this:

### Historical Cycle Peaks
– **2013 peak**: ~$1,150 (about 12 months after Nov 2012 halving)
– **2017 peak**: ~$19,800 (about 17 months after Jul 2016 halving)
– **2021 peak**: ~$69,000 (about 18 months after May 2020 halving)
– **2024–2025 peak**: ~$126,200 in October 2025 (about 18 months after April 2024 halving)

### Drawdowns From Peak
– 2013 → 2015: ~**-85%**
– 2017 → 2018: ~**-84%**
– 2021 → 2022: ~**-77%**
– 2025 → 2026: ~**-50%** (so far — notably shallower)

## The Stock-to-Flow (S2F) Model

Created by pseudonymous Dutch analyst **PlanB** in 2019, the Stock-to-Flow model attempted to price Bitcoin based on its scarcity:

$$\text{S2F} = \frac{\text{Existing Supply (Stock)}}{\text{Annual New Supply (Flow)}}$$

**Reference S2F values:**
– Gold: ~62
– Silver: ~22
– Bitcoin pre-2020: ~25
– Bitcoin post-2020: ~56
– Bitcoin post-2024: ~120
– Bitcoin post-2028: ~240+

### The Predictions
PlanB’s model predicted:
– **$100K** Bitcoin by end of 2021 (missed — peaked at $69K)
– **$100K–$288K** average price during the 2024–2028 cycle
– **$1M+** by 2028 in some extended versions

### Why S2F is Controversial
– **Spurious correlation**: Critics argue it’s curve-fitting on only 3–4 data points.
– **Ignores demand**: Pure supply-side model with no demand variables.
– **Failed predictions**: The 2021 cycle deviated significantly, and PlanB has since walked back specific targets.
– **Ethereum killed the parallel S2F**: When ETH switched to PoS in 2022, its S2F skyrocketed but price didn’t follow proportionally — undermining the universal applicability claim.

Despite criticism, S2F remains influential as a *narrative* and rough framework even if not a precise predictive tool.

## Why the 2024–2025 Cycle Was Different

The fourth cycle has broken with tradition in several important ways:

### 1. Pre-Halving All-Time High
For the first time, Bitcoin set a new ATH (~$73,000 in March 2024) **before** the halving — historically, ATHs came 12–18 months *after*. This is largely attributed to the **U.S. spot Bitcoin ETF approval in January 2024**.

### 2. Institutional Demand Shock
The spot ETFs (BlackRock’s IBIT, Fidelity’s FBTC, etc.) absorbed Bitcoin at unprecedented rates:
– **BlackRock IBIT** became the fastest ETF ever to reach $10B AUM (~7 weeks).
– ETFs cumulatively bought multiples of daily new issuance.
– This created a structural demand layer that didn’t exist in prior cycles.

### 3. Sovereign and Corporate Adoption
– **MicroStrategy** accumulated over 450,000 BTC (worth tens of billions).
– The **U.S. Strategic Bitcoin Reserve** was established under the Trump administration in 2025.
– Several U.S. states (Texas, New Hampshire, others) passed Bitcoin reserve legislation.
– El Salvador, Bhutan, and other nations continued accumulating.

### 4. Shallower Drawdown
The 2025–2026 correction (~50%) is far milder than the 75–85% drawdowns of prior cycles.

Disclaimer; This content was assisted by AI and reviewed by human experts.