Connect interfaces, execution, persistent state and trust boundaries.
LET’S PICTURE IT
A rulebook, an instruction form, a notebook and a reporter all play different roles. A contract system may need each of them.
SEE IT FOR YOURSELF
A valid counter call, step by stepStep 1 / 4
This example begins with count zero and a request to call increment(). No real contract is deployed.
This example begins with count zero and a request to call increment(). No real contract is deployed.Execution follows the code’s input and permission rules. A website button is not the access-control mechanism.The function reads zero, calculates zero plus one, and writes one to persistent storage.The accepted state contains count one. Later reads can inspect it. Events are emitted only if the code implements them.
Animated local teaching model. No wallet, RPC or live blockchain data. Some labels and hashes are abbreviated for readability.
Interface scenario
A website shows transfer(address,uint256) with an amount of 100. The ABI describes how to encode it. The implementation and token metadata determine behavior and display meaning; the argument type alone does not make it 100 ETH.
Execution scenario
An exposed function changes a setting only for an owner. The permission must be enforced in code. Hiding the settings page from ordinary users does not prevent them from preparing a direct call.
External-data scenario
A contract reads a price supplied by an oracle. Verifying a report’s signature can establish which signer authorized it, while freshness and accuracy need their own checks and assumptions.
Upgrade scenario
A proxy keeps the same address while its authorized implementation changes. Inspect the upgrade policy and state-layout compatibility. A familiar address and a verified source badge do not alone establish permanent behavior or safety.