A token announces a maximum supply of one billion units. Fine. But does its smart contract allow an address to create 10 billion additional tokens? The project claims to be decentralized. Who can still pause transfers? A team says it has renounced ownership of the contract. Is there still an administrator role capable of changing certain rules? And what if the visible contract is merely a proxy whose code could be replaced tomorrow?
This is why knowing how to read a smart contract is becoming a useful crypto skill, even without being a developer.
This is not about learning Solidity in one evening. A full audit requires much deeper technical expertise: architecture, business logic, interactions between contracts, EVM security, external calls, storage manipulation, testing and economic attacks. Reading a few functions on Etherscan is absolutely no substitute for that work.
The goal is more modest, and much more accessible.
An ordinary user can already verify the contract address, check whether its code is public, identify its owner, search for certain sensitive functions, understand who can call them, spot a role-based system, check whether the supply can increase and find out whether the code can be modified.
This process will not answer every question.
It can nevertheless reveal some very good ones.
And sometimes, a single function is enough to completely change the analysis of a token.
Start with what the contract actually allows
A smart contract is not a legal document filled with promises. It is a program executed by a blockchain.
On Ethereum, it has an address, contains data and exposes functions. Some functions merely read that data. Others modify it when a valid transaction calls them. Ethereum thus describes a contract as a program living at a specific network address.
This definition may sound technical. It becomes much simpler with an example.
A token contract may essentially contain the following information:
token name;
symbol;
total supply;
the balance of each address;
transfer rules;
administrative permissions;
mechanisms that may allow tokens to be created or destroyed.
Our complete crypto glossary already covers concepts such as wallets, multisigs, vesting and conditional contracts. Here, we need to go one step further: observe the rules directly where they are executed.
Step one: find the contract’s actual address
Before reading any code, you first need to analyze the right contract.
The ticker is never enough.
Anyone can create a token called USDT, PEPE or LINK, or reuse the name of a project that has not even launched its asset yet. Two tokens can display exactly the same name and symbol while being controlled by completely different contracts.
The important identifier is the contract address.
On Ethereum, it looks like a long string beginning with 0x.
Ideally, it should be obtained from several consistent sources:
the project’s official website;
its documentation;
and, where applicable, links published by the team through its official channels.
Resist a common reflex: simply search for the token’s name on Google and click the first contract that looks like the right one.
A copy may have the same ticker.
Not the same address.
Once you have the address, you can open it on Etherscan for Ethereum, or use the relevant explorer for the blockchain concerned. The general principle remains similar across several EVM networks.
“Source Code Verified” is the first filter
On Etherscan, open the Contract tab.
The first important piece of information is whether the code has been verified.
When a developer verifies a contract, Etherscan compiles the submitted source code and checks that it matches the bytecode on the blockchain. In the case of an exact verification, readers obtain a human-readable version of the program corresponding to the deployed contract, along with its ABI and various compilation details.
This is extremely important.
Without verification, the blockchain still contains the program. But what readers mainly see is bytecode intended for the EVM, which is much less practical to analyze manually.
A verified contract therefore turns something resembling a mass of machine data into readable Solidity files.
One mistake must nevertheless be avoided.
Verified does not mean audited.
And audited does not mean invulnerable.
Ethereum’s documentation on smart contract verification notes that verification is essentially used to establish a match between the source code and the deployed bytecode. It does not guarantee that the logic is safe.
A developer can perfectly publish the code of a contract containing a function that allows an unlimited number of tokens to be created.
The code will be verified.
And the risk will remain very real.
Verification provides transparency.
It does not provide a certificate of good conduct.
The Read Contract tab is your best friend
A non-developer does not even need to start with the Solidity files.
Etherscan generally offers two much more readable interfaces:
Read Contract
and
Write Contract.
Read Contract lets you view the public data exposed by the program without changing the blockchain or paying gas. Write Contract contains functions capable of triggering transactions and therefore modifying the contract’s state.
Let’s start with Read.
For a standard ERC-20, you may find functions such as:
name
symbol
decimals
totalSupply
balanceOf
owner
These words already provide a great deal of information.
name() gives you the name.
symbol() gives you its ticker.
totalSupply() shows the supply created at that moment.
balanceOf(address) lets you check how many tokens an address holds.
owner() may reveal the address with administrative power if the contract uses the corresponding ownership model.
You do not need to understand every Solidity brace to use these functions.
Etherscan turns the smart contract interface into a series of fields.
It is almost like a form.
Watch out for decimals
One detail often confuses beginners.
You open totalSupply() and see:
1000000000000000000000000000
A billion billion?
Not necessarily.
Most ERC-20s use decimals. OpenZeppelin uses 18 decimals by default in its ERC-20 implementation. A wallet interface then divides the integer values used by the contract by 10^18 to display an understandable amount.
So:
1 000 000 000 000 000 000
may simply represent 1 token with 18 decimals.
Before interpreting a supply, check decimals().
It is a small detail.
It prevents major misunderstandings.
Now find owner
The next question is more important:
who controls the contract?
If an owner() function exists, click it.
You will generally get an address.
Copy it.
Open it.
Is it a personal wallet?
Another smart contract?
A multisig?
A timelock?
A governance contract?
The address alone is therefore not enough. You need to go one level deeper.
OpenZeppelin describes Ownable as one of the simplest forms of access control: one address is designated as the owner, and functions protected by an onlyOwner-type mechanism are reserved for it.
This can be perfectly reasonable.
A team may sometimes need to manage certain parameters, especially when a protocol is launched.
The real question becomes:
what powers does this owner have?
An owner able only to modify a metadata address does not present the same risk as an owner able to mint, freeze, confiscate, change fees and replace all the code.
The existence of an administrator is therefore neither enough to condemn nor to reassure.
You need to read its powers.
Press Ctrl+F: onlyOwner
Now we reach the surprisingly simple part.
In the Code tab, use your browser’s search function.
Type:
onlyOwner
You will find the functions reserved for the owner in contracts using this convention.
Fictional example:
function setFee(uint256 newFee) external onlyOwner
Even without knowing how to code, the sentence is almost readable.
function setFee
a function allows the fees to be changed.
newFee
it receives the new fee level.
external
it can be called from outside the contract.
onlyOwner
only the owner can use it.
You have just read part of a smart contract.
There is no need to understand how the EVM works.
Now ask the right question: is there a limit on the new fee level?
For example:
require(newFee <= 5)
may indicate a limit of 5, depending on how the percentage is represented.
With no visible limit, the function could allow much larger values, depending on the rest of the logic.
Do not jump to conclusions immediately.
Follow the variable.
onlyOwner is not the only permission system
More complex projects often use roles.
Also search for terms such as:
hasRole
onlyRole
DEFAULT_ADMIN_ROLE
MINTER_ROLE
PAUSER_ROLE
UPGRADER_ROLE
The names vary.
OpenZeppelin specifically offers role-based access control so that different accounts can have different responsibilities: minting tokens, pausing, administration and other operations.
This is often preferable to a single key controlling absolutely everything.
But you still need to see who holds those roles.
A project may announce:
“Ownership renounced.”
Very impressive.
Then leave a DEFAULT_ADMIN_ROLE capable of granting MINTER_ROLE to a new address.
Renouncing owner does not then answer the real question.
The real power lies elsewhere.
Never look only for the owner. Look for all permissions.
mint: can new tokens be created?
For a token, one of the most obvious searches is:
mint
The mint function generally creates new units.
Ethereum uses this example in its educational documentation: a mint function can increase a recipient’s balance, with a control restricting its use to the owner.
The presence of a mint function is not automatically worrying.
USDC, stablecoins, rewards systems, staking and blockchains with programmed issuance: many legitimate models require the creation of new tokens.
The questions are instead:
who can mint?
How much?
Under what rules?
Is there a maximum supply?
Is minting used by an automated mechanism or by an administrator?
A project tells you it has a maximum supply of 100 million tokens.
The contract contains:
mint(address to, uint256 amount) onlyOwner
and no clear limit.
You have a question to ask.
Is the marketing supply really capped at the contract level?
If so, where?
A cap may be defined elsewhere, in an ERC20Capped extension, a MAX_SUPPLY variable or a condition.
Do not stop at the word mint.
Look for the constraint.
burn is not always as bullish as the marketing claims
burn destroys tokens.
The term is very popular with investors because it suggests a declining supply.
But once again, you need to see who can burn what.
Can a user simply burn their own tokens?
Can the administrator burn those belonging to another address?
Does the protocol actually buy back tokens before burning them?
Or does it merely destroy some newly issued tokens?
An economy that creates 100 million new tokens and then burns 20 million remains inflationary by 80 million.
The function is interesting.
The supply balance matters more.
pause: emergency button or centralized power?
Search for:
pause
unpause
paused
OpenZeppelin officially offers an ERC20Pausable mechanism that can suspend transfers, minting and burning when the contract integrates it and the corresponding functions are correctly linked to access control. The idea can serve as an emergency button when a major vulnerability is discovered.
This is a perfect example of a function that can appear both reassuring and worrying.
Reassuring:
if an exploit begins, the team may be able to stop the system.
Worrying:
someone has the power to stop the system.
The right analysis is therefore not:
“pause = scam.”
It is:
who can trigger the pause?
A single key?
A multisig?
A governance mechanism?
Is there a timelock?
What exactly happens during the pause?
All transfers?
Only certain operations?
This is the difference between identifying a function and understanding a risk.
blacklist, blocklist and freeze
Next, search for various terms:
blacklist
blocklist
freeze
frozen
isBlocked
denylist
They may reveal an ability to block certain addresses.
Again, this does not prove malicious behavior.
Some centralized stablecoins deliberately include compliance mechanisms that can freeze addresses linked to sanctions or stolen funds.
But if you thought you were buying a completely censorship-resistant asset, this function changes your analysis.
The code does not necessarily say:
“this is bad.”
It says:
“this is the power that exists.”
You must decide whether it matches the project’s promise.
Look for functions that change fees
Some tokens charge a tax on transfers.
Search for:
fee
tax
setFee
setTax
buyTax
sellTax
marketingFee
liquidityFee
setFees
You may find that the contract distinguishes between buying and selling.
For example, a 2% tax may fund the treasury.
Nothing unusual.
The problem arises when the administrator can change that tax without a reasonable cap.
A token may then operate normally today and become practically impossible to sell tomorrow if an extremely high tax can be applied.
This technique appears in some honeypots or malicious tokens.
The mere existence of a setTax function is not proof of a honeypot.
The absence of a limit nevertheless deserves to be understood before buying.
Transaction limits can also trap users
Search for:
maxTx
maxTransaction
maxWallet
tradingEnabled
enableTrading
limits
cooldown
These functions are sometimes used to protect a launch from bots or prevent excessive token concentration.
They can also give the administrator enormous control over trading.
A project may, for example, set a maximum sale size.
You need to see whether that size can be reduced arbitrarily.
The same logic applies to tradingEnabled.
If the owner decides when transfers become unrestricted, that may be logical before launch.
After launch, the question changes:
can they disable them again?
excludeFromFee deserves a closer look
A tax applies to all investors.
Except certain addresses.
Why?
This is sometimes perfectly normal: a router, liquidity contract, treasury or other technical components may require special treatment.
But a whitelist of privileged wallets can also create a significant advantage.
Search for:
excludedFromFees
isExcludedFromFee
whitelist
isWhitelisted
Then look for how this list can be changed.
Who adds an address?
Who removes it?
What does the status allow?
Analyzing a smart contract often works like an investigation: one word leads to a function, which leads to an address, which leads to another contract.
You are not reading everything.
You are following the power.
The real warning signs are hidden in the permissions
At this point, you already know how to read much more than a price on CoinMarketCap.
Nevertheless, the core problem remains: modern smart contracts rarely operate alone.
They inherit from libraries.
They call other contracts.
They delegate certain functions.
They are sometimes controlled by several administrators.
Or they can be replaced by a new version.
This is where reading becomes truly interesting.
The owner may be a multisig
You click owner().
The address you obtain is not a conventional wallet but a smart contract.
This is not necessarily more complicated.
This contract may be a multisig.
A multisignature requires several keys to approve a sensitive operation.
This matters because the risk changes considerably.
One compromised administrator key:
one person may potentially act.
3-of-5 multisig:
an attacker will generally need to compromise enough signers to reach the threshold.
This is not an absolute guarantee. The signers may be controlled by the same organization. Devices may be poorly secured. A threshold may be too low given the capital being administered.
Bref Crypto recently illustrated this topic with an analysis of USDT’s administrative powers on Tron. The issue did not concern a key providing direct access to USDT held in every wallet. It concerned administrative control of the contract itself.
This is exactly the kind of nuance that reading a smart contract can provide.
A timelock can completely change the risk
Now imagine that the administrator can change a function.
Fine.
Can they change it immediately?
Or must the operation wait 24 hours, 48 hours or a week?
A timelock imposes a delay between scheduling an administrative operation and executing it.
For the user, the difference is enormous.
An administrator key without a delay can change certain parameters almost instantly.
With a public timelock, observers may be able to see the planned change before it is activated.
They then have time to react.
Search for:
TimelockController
delay
minDelay
getMinDelay
schedule
execute
If the contract uses a governance system, also look at who can propose the operation and who can execute it.
A decentralized architecture is not only a question of the number of wallets.
It is a question of power and timing.
“Ownership renounced” may be almost meaningless
This phrase regularly appears in token marketing:
Ownership renounced.
It generally means that the owner transferred the role to an unusable address or used renounceOwnership().
Fine.
But before celebrating, ask five more questions.
Is there a separate AccessControl?
A proxy admin?
A minter role?
An upgrade role?
Another privileged function?
Ownership is only one permission system among others.
A team could technically renounce the owner role for part of the system while still controlling another contract capable of changing the protocol’s effective behavior.
That is why the search must cover the entire control path.
The word “renounced” is a starting point.
Not a conclusion.
Look at the imports
At the top of the Solidity file, you will often find lines such as:
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
or:
import "@openzeppelin/contracts/access/Ownable.sol";
Even without understanding Solidity, these imports provide clues.
The contract reuses external components.
Ethereum specifically encourages the use of recognized libraries rather than constantly rewriting the same mechanisms, particularly for standard behaviors such as administration or emergency pauses.
OpenZeppelin is extremely widespread.
Seeing a known library is generally more reassuring than a completely bespoke implementation of a standard feature.
But once again:
using OpenZeppelin does not automatically make a contract safe.
A developer can take an excellent ERC-20 component and then add a dangerous function.
So focus especially on what the project adds or overrides.
public, external, private, internal
A few Solidity terms are enough to read functions more effectively.
public
the function can, among other things, be called from outside.
external
it is part of the interface callable from outside.
private
it can only be accessed inside the contract where it is defined.
internal
it can be used by that contract and certain contracts that inherit from it.
Ethereum explains these different visibility types in detail in its documentation.
Watch out for an important trap:
public does not necessarily mean that everyone can successfully execute the function.
A function can be public and include:
onlyOwner
or a condition:
require(msg.sender == admin)
Visibility tells you how the function can be called.
Access control tells you who is authorized.
Both pieces of information must be read together.
view and pure are generally less concerning
A function marked view promises not to modify the contract’s state.
A pure function must not read or modify the state.
For a first analysis, they are generally less important than functions capable of writing to the contract.
Ethereum cites balanceOf() as a typical view function: it checks a balance.
By contrast, a function capable of changing a parameter, transferring an asset, creating tokens or changing a permission deserves more attention.
This is not an absolute security rule.
It is a sorting method.
Do you not know how to code?
Start by looking at who can change something.
payable means the function can receive ETH
Another useful term is:
payable.
A payable function can receive ETH along with the call.
This is not inherently dangerous.
A payable NFT mint, token sale or certain DeFi protocols need it.
But if you are studying a function to which the user must send funds, understand what it does before signing.
Web3 interfaces sometimes make the experience so seamless that we forget a click constitutes a transaction sent to a program.
Understand approve before looking at exotic code
Sometimes, the most important risk does not come from a strange function at all.
It comes from a standard.
With ERC-20, approve(spender, amount) allows another address or smart contract to spend a certain quantity of your tokens through the allowance mechanism.
This is essential to a large part of DeFi.
A DEX, for example, must be able to transfer the tokens required for a swap.
But an extremely large approval granted to the wrong contract can expose the relevant funds.
That is why an approve transaction should not be interpreted as:
“I am just confirming something.”
You are granting a permission.
Look at:
which token?
which spender?
what amount?
An unlimited approval may remain valid long after the initial interaction.
Here too, knowing how to read the words is already enough to significantly improve your security.
Be wary of a function whose name is too reassuring
Function names are chosen by developers.
A function called:
safeTransfer
is not automatically safe.
A function named:
protectUsers
does not necessarily protect users.
A function named:
renounceOwnership
may have been modified in a customized contract.
You need to see what it actually executes.
This is particularly important in deliberately obfuscated scams.
The developer may choose innocent-sounding names.
The executed code matters more than the name.
The main contract may import the real logic from elsewhere
You open a token contract.
The main file contains 50 lines.
Great.
Except that it inherits from five other contracts.
The logic is elsewhere.
Look for the declaration:
contract MyToken is ERC20, Ownable, Pausable...
The word is indicates inheritance here.
Part of the behavior therefore comes from the listed contracts.
Etherscan generally displays the different files in a verified contract. You can move from one to another.
A non-developer does not necessarily need to read thousands of lines of OpenZeppelin code.
The main point is to identify:
which part is standard;
which part is specific to the project.
The custom logic often deserves the most attention.
Events also tell the story
Smart contracts can emit events recorded in logs.
Ethereum explains that these events allow interfaces and applications, among other things, to track changes produced by the contract.
For users, this becomes useful when they want to check whether a power has actually been used.
Look for events such as:
OwnershipTransferred
RoleGranted
RoleRevoked
Paused
Unpaused
Upgraded
The names vary by contract.
You can then move beyond the question:
“can the administrator do this?”
and ask:
“have they already done it?”
A contract may theoretically have an emergency function that has never been used.
Another may regularly change its parameters.
On-chain history provides context.
The administrator’s transactions can be more revealing than its promises
Once you have identified the owner or multisig, open its address.
Look at its transactions.
What kind of operations does it perform?
Fee changes?
Mints?
Ownership transfers?
Upgrades?
Regular treasury movements?
Analyzing a smart contract is therefore not limited to reading static code.
The blockchain also shows how that power has been used.
That is a considerable advantage of the system.
Documentation can be rewritten.
A confirmed transaction remains in the history.
Compare the powers with the project’s communications
This is where reading becomes journalistically interesting.
Is the contract consistent with the narrative?
The project says:
“fixed supply.”
Does the contract allow additional minting?
“Fully decentralized.”
Who holds the critical permissions?
“Users cannot be blocked.”
Is there a blocklist?
“Immutable contract.”
Is there an upgrade mechanism?
“Sovereign community.”
Does a team multisig still hold veto power?
You should not necessarily cry foul at the first discrepancy.
A complex architecture may have sound technical reasons.
But the contradiction deserves an explanation.
This is where the smart contract becomes much more than a technical file.
It becomes a tool for checking promises.
A smart contract may also depend on external data
On-chain code does not spontaneously know the price of oil, the result of a match or US GDP.
It may need an oracle.
Bref Crypto recently showed how Chainlink now distributes certain US economic data to smart contracts. The contract can then act on the basis of data coming from the outside world.
This creates a new question:
where does the information come from?
If you are analyzing a lending platform, the collateral price may depend on an oracle.
A faulty oracle can trigger incorrect liquidations even when the smart contract logic works exactly as intended.
“The code works” therefore does not always equal “the system works.”
Dependencies matter.
The proxy is the trap every beginner needs to know
You found the address.
The code is verified.
The owner looks correct.
No dangerous mint function.
You think you are done.
Then a small message appears on Etherscan:
Proxy.
At that point, your analysis changes.
A proxy generally separates the address used by users from the logic that actually executes the program.
To simplify: you interact with the same door, but the room behind that door can be replaced.
Why developers use proxies
A conventional smart contract deployed on Ethereum cannot be modified like an ordinary Web2 application.
If an error appears, there is no simple “replace the file on the server” button.
Upgradeability addresses this problem.
With a proxy, users continue interacting with a stable address while calls are delegated to an implementation contract containing the logic.
During an upgrade, the implementation can change.
The data can remain at the proxy level.
OpenZeppelin documents the Transparent and UUPS patterns in particular, two common upgradeable architectures. In a transparent proxy, the proxy’s administration manages upgrades; in UUPS, the upgrade logic is mainly located in the implementation and must be protected by an authorization mechanism.
For developers, this provides considerable flexibility.
For investors, it introduces a huge question:
who can change the code?
A contract audited today may be different tomorrow
Imagine:
Audited Version 1.
No unlimited minting.
No excessive fees.
Great.
However, the proxy has an administrator capable of replacing the implementation.
Two months later, it moves to Version 2.
The new logic may be different.
The audit of the first contract is no longer necessarily sufficient.
This is why OpenZeppelin describes an upgradeable deployment as containing at least proxy logic and an implementation, with mechanisms allowing the proxy to point to a new implementation during an upgrade.
This is not automatically a flaw.
DeFi makes extensive use of upgradeability because fixing bugs and evolving a protocol can be essential.
But an upgradeable protocol and an immutable protocol do not have exactly the same trust model.
Etherscan helps with “Read as Proxy”
Fortunately, modern explorers often detect proxies.
Etherscan indicates that additional proxy-related tabs may appear in the Contract section. Its interface also distinguishes between code, read functions and write functions.
You may then see options such as:
Read as Proxy
Write as Proxy
and the implementation address.
For a beginner, the rule is simple:
if Etherscan indicates Proxy, do not read only the small proxy contract. Find the implementation as well.
This is generally where the business logic resides.
Look for upgradeTo and upgradeToAndCall
In an upgradeable system, the following names deserve your attention:
upgradeTo
upgradeToAndCall
_authorizeUpgrade
implementation
ProxyAdmin
admin
OpenZeppelin notably uses upgradeToAndCall in its current proxy upgrade mechanisms and explains that transparent proxies rely on a ProxyAdmin, while UUPS places authorization in the implementation’s logic.
Once again, the function is not the problem.
The power is the problem.
Who can call the upgrade?
A personal address?
A 2-of-3 multisig?
A 5-of-8 multisig?
Governance?
A seven-day timelock?
These architectures have profoundly different risk profiles.
The proxy may even conceal several layers
A complex protocol may use:
proxy → implementation → another contract → oracle → bridge → multisig.
Welcome to DeFi.
This is precisely when you need to know your limits.
An individual can reasonably carry out a first-level analysis.
There is no need to pretend to conduct a professional audit of fifty nested contracts.
When the architecture becomes too complex, the right reaction is not necessarily:
“I have to understand everything.”
It may be:
“this system exceeds my personal analytical level; I will look at audits, bug bounties, technical documentation and independent assessments.”
Recognizing that limit is a skill.
An audit reduces risk; it does not eliminate it
Look for audits.
But at a minimum, read:
who conducted them;
when;
on which version;
which files were included;
which issues were found;
which issues remain open;
whether the contract has been modified since.
A “Audited by X” badge on the website is not enough.
The report matters.
A two-year-old audit of Version 1 does not automatically cover Version 4.
A protocol can also be technically secure yet economically vulnerable.
A lending contract can work exactly as intended while relying on a manipulable oracle.
A pool can follow its code and still lose significant amounts of money because of poor economic design.
The smart contract is only one part of the system.
Exact Match, Similar Match: do not confuse them
Etherscan distinguishes between several levels of verification.
An Exact Match precisely corresponds to the verified code and deployment information.
A Similar Match is based on a match with similar bytecode that has already been verified and has more limitations, particularly concerning certain deployment parameters.
Etherscan warns, for example, that different constructor arguments can change the actual behavior.
For a serious analysis, therefore, look at the type of verification.
The colored badge is not merely decorative.
The constructor tells you how the contract began
Search for:
constructor
This function runs once during a conventional contract deployment. It is often used to set initial parameters: the owner, the initial supply or various addresses. Ethereum uses the example of a constructor assigning owner = msg.sender.
Why does this matter?
Because a mint function may have disappeared after launch even though the entire supply was created in the constructor.
Or the contract may have assigned important roles to certain addresses from the outset.
In upgradeable proxies, the situation is more specific: implementations generally use an initialization function rather than a conventional constructor to initialize the proxy’s state.
Look for:
initialize
initializer
reinitializer
Incorrect initialization can even constitute a significant vulnerability in some upgradeable systems.
For beginners, the key point is:
constructor or initialize = how initial power was distributed.
delegatecall deserves particular attention
If you see:
delegatecall
you are probably entering more technical territory.
The mechanism essentially allows code from another contract to be executed while using the storage context of the calling contract. Proxies rely on this principle.
For a non-developer, there is no need to immediately understand every EVM detail.
Instead, ask:
to which address is the call delegated?
Can that address change?
Who controls that change?
Those are the economic questions behind the technical term.
selfdestruct no longer has the same meaning as before
Older security guides often recommended looking for selfdestruct as a major red flag that could allow a contract to be destroyed.
The situation has changed with Ethereum protocol updates: the opcode’s behavior has been significantly modified by recent upgrades. Old rules should therefore not be applied mechanically without considering the relevant version and network.
Ethereum nevertheless continues to classify the use of selfdestruct among state-changing operations when explaining the restrictions on view functions.
This is a useful broader reminder:
a smart contract guide dating from 2020 may be technically outdated in 2026.
Do not click Write Contract to “test” it
The Write Contract tab is very useful.
It can also trigger a real transaction.
Etherscan clearly explains that read operations do not change the blockchain, while Write Contract can submit a transaction requiring a wallet signature and gas fees.
So:
feel free to read Read Contract.
Be much more cautious with Write Contract.
Do not connect a wallet containing your main funds just to explore.
Do not test a function you do not understand.
Do not sign just to see “what it does.”
On a blockchain, curiosity can be irreversible.
The ABI can help you understand a contract without reading all the code
The ABI, or Application Binary Interface, essentially describes how to communicate with a contract’s public functions: their names, parameters, data types and return values.
Etherscan points out that a significant part of a contract’s interactions can be understood by reading the ABI, without analyzing every line of source code.
This is exactly the approach suited to our objective.
You do not need to know how to write:
function transfer(address _to, uint256 _value)
to understand that:
transfer
moves tokens,
_to
is the recipient address,
_value
is the amount.
The interface already translates much of the language for you.
A 15-minute method is enough for an initial filter
Now take an unknown token.
You have fifteen minutes.
This is the order I would use.
Minute 1: the address.
Check that the contract really corresponds to the official token.
Minute 2: verification.
Verified code? Exact Match? Proxy?
Minutes 3 to 5: Read Contract.
Look at:
owner
totalSupply
decimals
and the visible administrative functions.
Minutes 6 to 8: search the code.
Ctrl+F:
onlyOwner
onlyRole
mint
pause
blacklist
fee
tax
maxTx
upgrade
Minutes 9 and 10: permissions.
Who holds the roles?
Simple wallet?
Multisig?
Timelock?
Governance?
Minutes 11 and 12: proxy.
Is the contract upgradeable?
What is the implementation?
Who can change it?
Minutes 13 and 14: history.
Has the administrator already used these functions?
Have there been upgrades or role transfers?
Minute 15: consistency.
Do the powers you found match what the project says?
This is not an audit.
It is a basic technical check.
And it is already much better than buying because the logo looks nice.
The red, orange and green framework
You can even classify your observations without turning them into an automatic score.
Relatively reassuring:
exactly verified code;
use of widely documented standards;
clearly documented permissions;
sufficiently distributed multisig;
timelock on critical operations;
supply consistent with public information;
explicit limits on sensitive functions;
audits corresponding to the current version;
consistent administrative history.
Needs further investigation:
upgradeable proxy;
ability to pause;
controlled minting;
blocklist;
configurable taxes;
very recent contract;
multisig with few signers;
extensive administrative permissions.
These elements may have perfectly legitimate reasons.
Very concerning without a good explanation:
hidden arbitrary minting despite a fixed-supply promise;
taxes that can be changed to extreme levels;
ability to selectively block selling;
hidden administrator after an alleged renunciation of control;
proxy implementation modifiable by a single wallet even though the protocol presents itself as immutable;
unverified source code for a project already seeking significant capital;
major contradiction between the documentation and the code.
No single element automatically proves fraud.
Several contradictions together nevertheless seriously change the picture.
The smart contract will not tell you whether the token is cheap
This is a fundamental limitation.
You can perfectly analyze a safe contract belonging to a horribly overvalued token.
The smart contract does not answer:
is the FDV reasonable?
will unlocks dilute the market?
does the team know how to build a product?
does demand exist?
does the token capture economic value?
For that, you need to return to tokenomics, revenue, users, investors and liquidity.
Our previous tokenomics analysis and the contract are therefore two complementary layers.
Tokenomics: who will receive the tokens, and when?
Smart contract: what rules do those tokens follow, and who can change them?
A serious investor needs both.
The code will not tell you whether the team will lie tomorrow either
Even an immutable and perfectly written contract does not guarantee a project’s success.
The team may disappear.
The frontend may be compromised.
An external oracle may fail.
A bridge may be hacked.
Liquidity may disappear.
The market may abandon the product.
A smart contract is not the entire company.
It is merely one of the most verifiable parts.
That is already remarkable.
In traditional finance, an individual cannot open a bank’s internal software and check for themselves which administrative functions exist.
In crypto, part of the financial system is directly observable.
You still have to look.
Reading the contract mainly changes the questions you ask
This may be the real skill.
Before:
“Can this token go 10x?”
After a few minutes with the smart contract:
“Who can increase its supply?”
“Who can stop transfers?”
“Is this administrator address a multisig?”
“Why does an UPGRADER_ROLE exist?”
“Is the contract described as immutable really a proxy?”
“Is the tax cap written into the code?”
“Who can add an address to the blacklist?”
These are better questions.
They do not predict the price.
They reduce information asymmetry.
Reading a smart contract does not ultimately mean reading code
Not at first.
It means reading power.
Who can create?
Who can destroy?
Who can move?
Who can block?
Who can modify?
Who can replace the program?
And how many people are needed to do it?
Once you have these answers, everything else becomes much clearer.
A project can perfectly well embrace a centralized model.
A stablecoin may need compliance mechanisms.
A DeFi platform may retain an emergency button.
A young protocol may remain upgradeable before progressively transferring more control to its governance.
None of these choices is automatically bad.
What becomes problematic is when a system has more control than its communications suggest.
The blockchain has a useful feature in this respect.
Marketing can say “trustless.”
The smart contract, meanwhile, provides the administrator’s address.
The habit to keep
The next time you are interested in a token, do not start with its chart alone.
Copy its address.
Open the explorer.
Click Contract.
Check the code.
Open Read Contract.
Look for the owner.
Then search for a few words.
mint.
owner.
onlyRole.
pause.
blacklist.
fee.
upgrade.
You may not understand everything.
That is fine.
The goal is not to compete with a Solidity auditor.
The goal is to stop being completely blind to the program to which you are about to entrust money.
In a market where an elegant interface can conceal several layers of smart contracts, this skill is becoming almost as basic as knowing how to check an address before making a transfer.
A smart contract does not become simple because you do not know Solidity.
But many of its important powers can be made readable.
And often, the code does not need to tell you whether the project is “good.”
It only needs to show you who can change the rules after you arrive.
In brief
A non-developer can already learn a great deal from a smart contract without analyzing all of its logic. The correct address, the code verification status, owner, administrative roles, mint, pause and blacklist functions, fee modification mechanisms and upgrade systems provide a powerful first filter.
The most important point remains access control. A sensitive function is not necessarily dangerous if its use is limited by a multisig, governance or an appropriate timelock. Conversely, a simple wallet with extensive powers represents a much more centralized trust model.
Proxy contracts require particular attention. The address used by users may delegate its logic to a modifiable implementation. You therefore need to identify the implementation and the entity authorized to carry out upgrades.
Finally, verified code is neither an audit nor a guarantee. Etherscan verifies that the published code corresponds to the deployed program; it does not certify that the program is free of vulnerabilities.
