In brief
Transaction evidence moves through layers: wallet intent, node or mempool response, block inclusion, virtual processing, and accepted UTXO effects.
First Contact#
In a UTXO model, spendable coins live as outputs that have not yet been spent. A later transaction spends earlier outputs by referring to them as inputs. This is different from thinking only in account balances. Wallets may show a balance, but the protocol-level study path is outputs, inputs, validation, and UTXO state.
Working Model#
A transaction consumes one or more previous outputs and creates new outputs. Validation checks whether the inputs can be spent under the rules. When consensus processing accepts transaction consequences, UTXO diffs describe how spendable state changes. Indexers and APIs can help observe the result, but they are observation layers rather than replacements for protocol evidence.
Mechanics#
The UTXO path connects ordinary wallet language to implementation language. A wallet selects inputs, constructs outputs, signs what must be authorized, and submits a transaction. A node can reject the transaction before it reaches a block template. A miner can include a transaction in candidate work. Virtual processing and acceptance data decide what becomes consensus-visible accepted evidence.
Expanded UTXO Walkthrough#
The UTXO model is easiest to approach from the idea of spendable pieces. A wallet may show a balance, but protocol study follows outputs. An unspent output can be used as an input to a later transaction. That later transaction consumes previous outputs and creates new outputs. The useful first-contact idea is not "an account balance changed"; it is "which outputs were consumed, which outputs were created, and when did consensus processing make that change accepted evidence?"
This model connects directly to the transaction lifecycle. A wallet may select outputs and build a transaction. RPC submission may deliver it to a node. Mempool admission may make it a candidate for relay or mining. A block template may include it. A mined block may later be processed. Accepted data and UTXO diffs are the stronger evidence that the guide is trying to route the reader toward.
The page should not imply that a wallet display, indexer row, or explorer page by itself proves the full protocol state transition. Those tools can be useful observation surfaces, but the source path for accepted evidence and UTXO diffs carries the stronger claim.