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Yes—if a standard externally owned account (EOA) signed the transaction, its secp256k1 public key can normally be recovered from the signature and the transaction’s signing hash. The 20-byte address shown by explorers is not the full public key. It is derived from that key by taking the last 20 bytes of its Keccak-256 hash.
To check a particular transaction, obtain its structured transaction object or raw signed bytes, identify the transaction format, reconstruct the correct unsigned signing hash, recover the public key with a maintained Ethereum library, and derive an address from the recovered key. If the derived address equals the transaction sender, the signature is internally consistent and the public key is recoverable from that transaction.
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What “exposes your public key” means
Ethereum uses three different pieces of key-related information that are easy to conflate:
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- Address: the familiar 20-byte identifier. For an EOA, it is derived from the public key by hashing the key with Keccak-256 and taking the last 20 bytes.
- Public key: the secp256k1 verification key used to check signatures. A valid ECDSA signature, together with the correct message hash and recovery information, lets software reconstruct it.
- Private key: the secret value used to create signatures. Recovering a public key does not reveal the private key.
Ethereum.org’s account documentation puts the key point this way: “Others can then take the signature to derive your public key, proving the author of the message.” In other words, the key may be recoverable even when no transaction field is labeled “public key.”
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The precise result to report is therefore: “The public key is recoverable from this transaction signature.” Saying that the public key is literally printed in the transaction is less precise. Transaction data normally exposes signature components; a wallet, RPC response, or block explorer may or may not display a separately labeled recovered key.
What you need before starting
Use one of these representations:
- A complete transaction object containing the sender, nonce, gas and fee fields, value, destination, input data, chain identifier where applicable, transaction type where applicable, and signature values.
- The raw signed transaction bytes, which a protocol-aware library can decode into the same fields.
A transaction hash alone is not enough for a transparent manual check. The hash normally shown as a transaction identifier is the hash of the signed, serialized transaction. Public-key recovery needs the signing hash of the unsigned transaction payload, plus the signature’s recovery information. Do not substitute the final transaction hash for that signing hash.
Obtain the data from a trusted RPC response, your wallet’s exported signed transaction, or an explorer that lets you inspect the complete transaction object or raw bytes. Preserve the exact hexadecimal values, including leading zeroes, and record the network on which the transaction was sent.
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1. Confirm what kind of sender you are checking
The standard recovery procedure is for an EOA transaction signed with secp256k1 ECDSA. An EOA is controlled directly by a private key. A contract account is code, not a private-key account, and its authorization rules are not established by applying this procedure to the contract address.
A transaction that calls a contract can still have an EOA as its outer sender. In that case, recover the key for the EOA that signed the outer transaction, then compare the derived address with the transaction’s from value. Do not treat the destination contract’s address as the signer’s address.
2. Decode the transaction and identify its type
Determine whether the bytes represent a legacy transaction or a typed transaction. The type controls which fields are signed and how the signature is encoded. A decoder should expose the transaction type and its signature fields rather than forcing every transaction into the legacy layout.
At minimum, record:
- the transaction type or legacy status;
- the signature components (commonly represented as
r,s, and a recovery value such asvor a parity field); - the chain identifier, if it is part of the transaction format or signing rules;
- all unsigned transaction fields in their protocol order.
If a tool cannot tell you which envelope it decoded, stop there and use a maintained Ethereum library that explicitly supports both legacy and typed transactions. Applying legacy assumptions to a typed envelope can produce a plausible-looking but wrong key.
3. Reconstruct the unsigned signing payload
Build the exact data that the signer hashed before producing the ECDSA signature. This is not a free-form message and is not necessarily the same byte sequence as the final serialized transaction.
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For a legacy transaction protected by EIP-155, the signing payload includes the chain identifier and the two zero fields specified by that scheme. The recovery value v also carries chain-ID and recovery-parity information. Older unprotected legacy signatures use the earlier v convention instead. A library must distinguish these cases.
Typed transactions use type-specific envelopes and field lists. Their signing payload is constructed according to the rules for that type, rather than by inserting EIP-155 fields into a legacy list. The safe procedure is to let a maintained, type-aware Ethereum implementation decode the transaction and produce the signing hash.
At this stage, verify that the chain identifier is the intended one. A chain-ID mismatch changes the signing hash and can make an otherwise valid signature appear unrecoverable or recover to a different address.
4. Recover the secp256k1 public key
Pass the signing hash, the signature values, and the recovery information to the library’s Ethereum transaction-recovery routine. The operation uses ECDSA recovery on secp256k1 and returns a public key candidate.
Do not attempt to infer the key from r and s alone. Those values are only part of the recovery input; the message hash and recovery parity are also required. Likewise, do not use a generic message-signature routine unless it explicitly implements the transaction type and Ethereum’s signing rules.
A successful recovery should produce a correctly formatted uncompressed or compressed secp256k1 public key, depending on the library. Record which representation the library returns. The address derivation step must use the public-key bytes in the form required by that implementation, normally the uncompressed key without its format prefix when applying Ethereum’s address rule.
5. Derive the address from the recovered key
Hash the recovered public-key bytes with Keccak-256 and take the last 20 bytes. Format those bytes as an Ethereum address, applying the checksum presentation your tooling supports.
Compare the derived address with the transaction’s sender address. A match shows that the recovered key is the key corresponding to the signer represented by that sender. A mismatch means at least one input is wrong or the recovery model does not apply. Common causes include using the transaction hash instead of the signing hash, decoding the wrong transaction type, interpreting v incorrectly, using the wrong chain identifier, or comparing against a destination address rather than the sender.
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6. Record a reproducible result
For an audit note, save the transaction hash, network, decoded type, sender address, the exact signing-hash method used, and the recovered public key. State whether the derived address matched the sender. This makes it possible to repeat the check after a library upgrade or if an explorer changes its display.
Legacy and typed transactions are not interchangeable
| Format | What controls the signing hash | Signature and recovery detail | Practical implication |
|---|---|---|---|
| Unprotected legacy | The earlier legacy field list without EIP-155 chain-ID additions | Uses the older v convention |
Use a decoder that recognizes the pre-EIP-155 form |
| EIP-155 legacy | Legacy fields plus chain ID and the two EIP-155 zero fields | v encodes chain ID together with recovery parity |
Extract chain ID and parity before recovery |
| Typed transaction | The type-specific envelope and field order | Type-specific signature fields and parity encoding | Use a library that understands the particular typed envelope |
EIP-155 defines the chain-ID-aware rules for legacy signatures. Ethereum’s execution specification describes recovery from the signature values and the signing hash. Together, those rules explain why a one-size-fits-all “decode v, hash the visible fields” script is unsafe.
How to inspect what an explorer shows
Explorers commonly display a transaction hash, sender, recipient, nonce, gas and fee information, input data, and signature-related values. Those fields can be enough for a protocol-aware tool, but the interface may not expose a button labeled “show public key.”
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Use the explorer as a source of transaction data, not as proof that the interface has or has not recovered the key. The reviewed Ethereum documentation does not establish that every explorer displays a separately labeled recovered public key or that different explorers use the same labels.
If the explorer provides only a hash and a shortened summary, retrieve the full transaction object through an RPC method or export the raw signed bytes from the wallet that created the transaction. Ensure that the response includes the signature and every field needed to reconstruct the signing payload.
What the result says about privacy and security
Public-key recovery is not private-key theft
The recovered public key verifies the signature and links it to the sender address. It does not disclose the private key. Ethereum’s account documentation explicitly distinguishes the two: the private key cannot be derived from a public key.
Therefore, a successful recovery is evidence of public-key visibility or recoverability, not evidence that someone has calculated, extracted, or stolen the signing secret. Continue protecting the private key, seed phrase, and signing device as you would before running the check.
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EIP-8164 discusses the security implications of ECDSA authentication keys being exposed on-chain in a conditional post-quantum threat model. That is proposal-level security context. It should not be presented as evidence that an ordinary present-day attacker can routinely calculate an Ethereum private key from a recovered public key.
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The practical distinction is important: exposure describes what information a transaction makes recoverable; compromise describes unauthorized control of the private key. They are different claims and require different evidence.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common mistakes and fixes
Using the final transaction hash
Symptom: recovery fails or produces an address that does not match the sender.
Fix: calculate the signing hash from the unsigned transaction fields using the correct legacy or typed rules. The transaction identifier is the hash of the signed serialization and is not a substitute.
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Symptom: the recovered address is wrong for an older transaction or the chain ID appears nonsensical.
Fix: determine whether the legacy signature is EIP-155-protected or uses the older unprotected convention before interpreting v.
Parsing a typed transaction as legacy
Symptom: fields appear shifted, signature values are missing, or the library reports an invalid signature.
Fix: decode the type envelope first and use that type’s signing and recovery implementation.
Recovering with the wrong network
Symptom: the signature is mathematically valid but the derived address does not equal the displayed sender.
Fix: confirm the chain identifier and network associated with the transaction. For EIP-155 legacy data, chain ID is part of the signing rules.
Confusing sender and recipient
Symptom: the recovered address is compared with a contract or externally owned account receiving the transaction.
Fix: compare the derived address with the transaction’s sender (from), not the destination (to).
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Symptom: an explorer does not display a public-key field, so the transaction is treated as hiding the key.
Fix: inspect the signature and signing hash with a protocol-aware tool. Display behavior and cryptographic recoverability are separate questions.
EOA, contract, and authorization distinctions
The address-to-public-key derivation and signature-recovery explanation applies to a standard EOA transaction. A contract account is represented by code at an address and can enforce its own authorization logic. A call to a contract does not turn the contract address into the EOA signer, and recovering the outer transaction’s EOA key does not prove which internal contract authorization rule was satisfied.
Keep the scope of your conclusion explicit: “The EOA public key used to sign this transaction is recoverable” is narrower and more accurate than “the contract’s public key was exposed.”
What a sound conclusion looks like
After a correct, type-aware check, use wording that separates the cryptographic fact from the security interpretation:
- Cryptographic finding: “The secp256k1 public key is recoverable from the transaction signature and signing hash.”
- Consistency check: “The address derived from that key matches the transaction sender.”
- Security boundary: “This demonstrates public-key recoverability, not disclosure or recovery of the private key.”
- Scope: “The procedure applies to the EOA signature represented by this transaction format.”
No exposure-rate statistic should be inferred from an individual transaction. The available Ethereum documentation and proposal material do not establish a reliable percentage of transactions or users whose public keys are exposed, so report the result for the transaction you actually checked.
Source and version context
The account explanation on ethereum.org was updated August 6, 2026. The legacy chain-ID rules come from the final EIP-155 text, created October 14, 2016. Ethereum’s transaction documentation and execution specification describe transaction serialization, signature fields, and public-key recovery. EIP-8164 supplies the conditional post-quantum security discussion. Transaction formats, proposal status, and explorer interfaces can change, so a production audit should verify that its library supports the transaction types present on the target network.
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