21Relay

Bitcoin knowledge and practical tools

21Relay

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Bitcoin Academy

Learn Bitcoin step by step.

Choose a level and continue from where you left off.

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Beginner

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Money, Bitcoin, wallets, custody, transactions and mining.

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Intermediate

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UTXOs, fees, privacy, Lightning and practical node use.

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Advanced

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Consensus, Script, forks, SegWit, Taproot and security.

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Interactive PlaygroundAcademy progress

Library

Books and films worth your time.

A curated Bitcoin shelf with enough context to help you choose what to read or watch next.

Browse Bitcoin booksCurated titles, reading paths and status trackingWatch Bitcoin videosEducational explainers and documentariesRead the Bitcoin white paperThe original paper with supporting context
Explore the Library

Run a node

Run Bitcoin on your own terms.

A practical route from choosing hardware to maintaining a healthy, private node.

Start the node journey
Seven-stage guideFirst setup to maintenance
  1. Choose setup
  2. Check hardware
  3. Install
  4. Synchronise
  5. Maintain
  6. Improve privacy
  7. Troubleshoot

Bitcoin tools

Useful answers, without the clutter.

Estimate fees, transaction size, storage and purchasing scenarios without connecting a wallet.

View all tools
Sats ConverterConvert BTC, sats and fiatFee EstimatorCheck live sat/vB targetsTransaction SizeEstimate virtual bytesDCA CalculatorExplore regular purchase historyNode StoragePlan SSD requirementsNode ReadinessCheck a planned setup

Resources

Sources you can inspect.

Read the material behind important claims and see how 21Relay reviews and corrects its work.

Open resources

Primary sources where possible. Corrections when needed.

Resources hubFoundational material and selected educational mediaBitcoin white paperThe original paper with clear supporting contextEditorial standardsHow content is sourced, reviewed and correctedFeedback and correctionsReport an issue or suggest an improvement

About 21Relay

Independent by design.

21Relay combines structured learning, node guidance, references and practical tools without paid placement or wallet access.

Learn without handing over your wallet, your keys or your trust.

Education first
Plain language first, protocol detail when it matters.
No wallet required
Browse and use the tools without connecting funds or sharing keys.
References included
Important claims lead back to material you can inspect yourself.
About 21RelayEditorial standardsFeedback and corrections