Academy Lesson input

Summary

Reference to a previous output plus unlocking data proving spend rights.

No security notes for this node yet.

Direction	Relation	Node
Outgoing	PART_OF	Transaction
Outgoing	SPENDS	Unspent Transaction Output (UTXO)
Incoming	PART_OF	scriptSig
Incoming	PART_OF	Witness Data
Incoming	PART_OF	Sequence
Incoming	EXPLOITS	CVE-2018-17144

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Current Guided Lesson

What is Bitcoin?

0 of 8 lessons completed.

Hover the headers for quick tooltips, then read the short canonical distinction.

Bitcoin is pseudonymous: addresses are public identifiers without built-in real names, but flows can still be traced and clustered.

Nodes enforce consensus rules by validating blocks/transactions. Miners order transactions into blocks and compete in proof-of-work.

Wallets store and manage cryptographic keys used to sign spends. The bitcoin itself exists as UTXOs on the blockchain state.

Bitcoin base layer optimizes final settlement and security. Lightning optimizes speed and cost for day-to-day payment flow.