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What is Bitcoin

🔷 Property

Type: PropertyDifficulty: 1/4what-is-bitcoinVerified: 2026-02-12

Summary

Bitcoin is a decentralized monetary network where independent Full NodeSoftware that independently validates blocks and transactions against consensus rules. enforce a fixed supply and shared transaction history.

Story

A new learner opens Raw Block expecting a coin app and instead finds a coordination protocol. Every ten minutes, independent participants across the world converge on one ledger state without a central operator. Bitcoin is not a company server; it is open rules plus local verification. Each Full NodeSoftware that independently validates blocks and transactions against consensus rules. checks blocks and transactions independently, and that shared discipline keeps the system resilient against censorship and infrastructure failures. Once this model clicks, the rest becomes clearer: MinerParticipant that assembles candidate blocks and performs proof-of-work to extend the chain. provide cost-backed ordering, Full NodeSoftware that independently validates blocks and transactions against consensus rules. enforce validity, wallets manage keys, and settlement confidence grows with confirmation depth.

Deep Dive

System model

  • Bitcoin combines peer-to-peer networking, cryptographic signatures, and Proof-of-WorkConsensus mechanism where miners expend hashpower to find valid blocks below the target threshold. ordering.
  • State changes happen through valid transactions that spend existing UTXOUnspent Transaction Output. A spendable bitcoin output created by a prior transaction. and create new ones.
  • No central administrator can mint extra supply outside Consensus RulesNetwork-wide validation rules every full node enforces to determine valid blocks and transactions..

Why it matters

  • Independent verification lowers trust requirements compared to custodial ledgers.
  • Open participation creates censorship resistance and resilience through geography and ownership diversity.
  • Fixed issuance and predictable halving schedule provide credible monetary constraints.

Real Data

Current Block Height

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Latest known chain tip used to anchor all downstream learning modules.

Days Until Next Halving

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Estimated using blocks remaining and 10-minute average block interval.

Key Takeaways

  • Bitcoin is a protocol and network, not a company product.
  • Consensus RulesNetwork-wide validation rules every full node enforces to determine valid blocks and transactions. enforce supply and validity globally.
  • Full NodeSoftware that independently validates blocks and transactions against consensus rules. validate; MinerParticipant that assembles candidate blocks and performs proof-of-work to extend the chain. order; users hold keys.

Security Notes

  • Bitcoin security assumes broad independent validation by Full NodeSoftware that independently validates blocks and transactions against consensus rules..
  • Ledger history becomes harder to rewrite as confirmations accumulate.

Node Security Panel

Vulnerabilities (1)

Attacks (0)

    Assumptions (0)

      Policy vs Consensus (0)

        Policy vs Consensus

        Consensus RulesNetwork-wide validation rules every full node enforces to determine valid blocks and transactions. defines validity for the chain itself; policy defines local admission preferences into MempoolNode-local pool of valid, unconfirmed transactions awaiting block inclusion./relay.

        Consensus Rules

        • ConsensusBlock and transaction validity are deterministic under Consensus RulesNetwork-wide validation rules every full node enforces to determine valid blocks and transactions. checks.
        • ConsensusSupply creation must follow the protocol Block SubsidyProtocol-defined new bitcoin issuance in each block, halving every 210,000 blocks. schedule.

        Policy Rules

        • PolicyFull NodeSoftware that independently validates blocks and transactions against consensus rules. relay policy may reject low-fee or non-standard transactions.
        • PolicyPolicy settings can differ by Full NodeSoftware that independently validates blocks and transactions against consensus rules. without causing Consensus RulesNetwork-wide validation rules every full node enforces to determine valid blocks and transactions. forks.

        Security Research Panel

        2010 Value Overflow Incident

        2010

        A Consensus RulesNetwork-wide validation rules every full node enforces to determine valid blocks and transactions. bug allowed invalid inflation and showed why strict validation and rapid patch coordination are essential.

        Explorer Deep Links

        Some sources are external. When an internal Raw Block view is available, we'll surface it here.

        Claim Sources

        Bitcoin supply is bounded by protocol rules and halvings.

        Nodes independently validate each block and transaction.

        Claim Registry Links

        • Bitcoin has a capped total supply of 21,000,000 BTC enforced by Consensus RulesNetwork-wide validation rules every full node enforces to determine valid blocks and transactions..

          Verified: 2026-02-12

          Source

        Further Reading

        Graph Neighbors

        DirectionRelationNode
        OutgoingDEPENDS_ONTransactions Lifecycle
        OutgoingDEPENDS_ONWallets Hold Keys, Not Coins

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