ビットコイン (BTC) トケノミクス

Bitcoin (BTC) is the native token of the Bitcoin network, designed as a decentralized, peer-to-peer digital currency. Its economic model is defined by a fixed supply, a programmatic issuance schedule, and a Proof-of-Work (PoW) consensus mechanism that aligns the incentives of network participants.

Issuance Mechanism

Bitcoin's issuance is governed by a pre-programmed algorithm that ensures a predictable and finite supply.

• Maximum Supply: The total supply of Bitcoin is hard-capped at 21,000,000 BTC.
• Block Rewards: New BTC is issued through a process called mining. Miners use computational power to solve complex mathematical problems, and the first to succeed is granted the right to add a new block to the blockchain.
• Halving Events: To control inflation and simulate the scarcity of precious metals, the block reward is halved approximately every four years (or every 210,000 blocks). This process continues until the maximum supply is reached, estimated to occur around the year 2140.
• Proof-of-Work (PoW): The issuance is tied directly to the security of the network. Miners must expend physical energy (electricity) to earn newly minted BTC, ensuring that the creation of new tokens has a tangible cost.

Allocation Mechanism

Unlike many modern blockchain projects, Bitcoin did not have a private sale, ICO, or a centralized treasury allocation at its inception.

• Fair Launch: Bitcoin was launched through a "fair launch" model where any participant could mine the tokens from the genesis block onward. There was no pre-mine or initial allocation to founders, investors, or advisors.
• Current Distribution: While the initial allocation was open to all, current holdings have concentrated over time. For example, the United States Government holds approximately 208,109 BTC (~0.99% of max supply), and the Fidelity Wise Origin Bitcoin ETF holds roughly 196,721 BTC (~0.94% of max supply). Additionally, significant portions of the supply are held in legacy wallets, such as the address associated with the Mt. Gox hack, which contains approximately 79,957 BTC.

Usage and Incentive Mechanism

The Bitcoin ecosystem relies on a circular incentive structure where the token serves both as a tool for users and a reward for maintainers.

Locking and Unlocking Mechanisms

Bitcoin's core protocol does not feature a native "vesting" or "unlocking" schedule for its total supply in the way that smart-contract-based tokens do. However, specific technical and ecosystem-level locking mechanisms exist:

Technical Locking (Scripts)

Bitcoin utilizes a Script system to manage how UTXOs (Unspent Transaction Outputs) are spent.

• Locking Script: A spending condition placed on an output (e.g., requiring a specific digital signature).
• Unlocking Script: A script that "solves" or satisfies the conditions of the locking script, allowing the BTC to be spent.
• Time-Locks: Bitcoin supports time-locked contracts, which prevent an output from being spent until a specific block height or time has passed. These are frequently used in atomic cross-chain swaps and Layer 2 solutions like the Lightning Network.

Ecosystem Staking and Locking

While Bitcoin does not have native Proof-of-Stake, third-party protocols have introduced locking mechanisms to extend Bitcoin's utility:

• Non-Custodial Staking: Protocols like Core Chain and Babylon have introduced mechanisms where BTC can be "staked" or locked to secure other layers or earn rewards. For instance, over 4,800 BTC have been natively staked via Core Chain to unlock "BTCfi" utility.
• Wrapped Assets: BTC is often locked in smart contracts to mint representative tokens (like aBTC or SolvBTC) on other chains, allowing Bitcoin holders to participate in DeFi and earn yields.

Unlocking Time

Because Bitcoin's supply is issued through mining rather than a pre-allocated treasury, there is no "unlocking time" for the core supply. The "unlocking" of the total 21 million BTC is effectively the mining schedule, which is projected to complete in 2140. For specific ecosystem projects built on or around Bitcoin (such as Stacks or Babylon), unlocking schedules are typically based on Bitcoin block heights, often resulting in periodic releases (e.g., every 2,100 blocks or approximately every two weeks).