sincethefirstblock

Dříve v této sérii,
popisovali jsme, co se stane, když transakce vstoupí do systému.
Je přijímán sítí,
ověřeno a nakonec odráženo ve sdíleném stavu.

Ten proces již závisí na něčem fundamentálním.
Více nezávislých účastníků musí souhlasit se stejným výsledkem.
Ta dohoda
je to, co udržuje systém soudržný
jak se vyvíjí v průběhu času.
1. Konsensus
Blockchainové systémy udržují sdílený a konzistentní stav.
Aby se to stalo, účastníci se dohodnou na:
Které transakce jsou platné
Pořadí, v jakém jsou aplikovány

In the previous block,
we looked at how blockchain systems
are already used in practice,
through concrete applications and real examples.

Those systems do more than record information.
They transfer value,
update ownership,
and coordinate activity
across shared infrastructure.

So what happens
when conditions are met
and the system needs to act?
1. From shared records to actions
Blockchain systems maintain
a shared and consistent state.

Transactions update balances.
Ownership changes are recorded.
The system moves forward block by block.

But many applications require
more than recording what happened.

They require actions to occur
when specific conditions are met.
Why this matters:A shared record is only part of the system.Many real-world processes dependon conditional execution.
2. What are smart contracts
Smart contracts are programs
stored and executed on a blockchain network.

They define:
ConditionsRulesAnd resulting actions
Once deployed,

their logic becomes part of the system state.

Execution is performed by the network itself,

under the same rules for all participants.
Why this matters:

Execution does not depend

on a central operator

or discretionary approval.
3. How smart contracts operate
At a high level, smart contracts:
Read the current system stateEvaluate predefined conditionsApply deterministic logicUpdate the ledger accordingly
The same inputs
produce the same outputs.

Execution does not change

based on who triggers the contract

or when it is triggered.
Why this matters:

Outcomes are predictable

and can be verified independently.
4. Why this execution model exists
As systems grow,
manual coordination becomes inefficient.

Shared infrastructure requires:
Consistent behaviorRepeatable outcomesVerifiable execution
Smart contracts embed execution rules
directly into the shared system,

removing the need for manual enforcement.
Why this matters:

Coordination can scale

without increasing operational complexity.
5. Where this model is used
Today, smart contracts are executed
millions of times per day
across blockchain networks.

They are used to:
Move value conditionallyCoordinate multi-step processesEnforce predefined constraints
This model supports systems
that operate continuously
across different jurisdictions.
Why this matters:

Execution logic remains consistenteven as participation scales globally.
Final reflection
Smart contracts do not change
what blockchain systems are.

They extend what those systems can do.
By combining:
Shared stateVerifiable historyAnd deterministic execution
they enable more complex systems
— such as decentralized applications
and financial protocols —
to operate on top of the same infrastructure
without manual coordination.

This is the sixth block.

We start from the first block.
And we build from there.

#blockchain
#Infrastructure
#sinceTheFirstBlock