Use an Ethereum checksum address as an error check, not proof of ownership

Use an Ethereum checksum address as an error check, not proof of ownership

Mixed-case Ethereum addresses can carry a checksum that catches many typing errors. A valid checksum says the text is internally consistent; it does not say who owns the address or whether the current payment route accepts it.

EIP-55 specifies a capitalization checksum for hexadecimal Ethereum addresses. The proposal describes encoding and validation but does not bind an address to a person, platform or supported network.

Identify the network before the string

Record the named blockchain and asset before copying the destination because compatible chains may share address syntax. Check the current account instruction rather than an old screenshot.

Do not infer network support from a 0x prefix. The specification supports using current wallet software to reject malformed mixed-case text and comparing the entire destination rather than a short visual prefix and suffix.

Let reputable current wallet software parse the address and flag invalid mixed-case capitalization. Avoid websites reached from advertisements for this check. A lowercase address may omit the checksum signal entirely.

Validate the checksum locally

Let reputable current wallet software parse the address and flag invalid mixed-case capitalization. Avoid websites reached from advertisements for this check.

A lowercase address may omit the checksum signal entirely. It cannot detect a correctly checksummed attacker address, establish account ownership, distinguish every compatible network, reverse a transfer or state current deposit terms.

Read the full destination against the authenticated source after the clipboard operation. Clipboard malware can substitute a different valid address. A matching beginning and ending is insufficient evidence.

Compare every character after paste

Read the full destination against the authenticated source after the clipboard operation. Clipboard malware can substitute a different valid address.

A matching beginning and ending is insufficient evidence. Generate the destination inside the authenticated account, preserve its chain context, validate the checksum and compare all characters after pasting into the sending wallet.

Use a trusted explorer to see whether code exists at the destination and whether the intended asset transfer matches the route. Do not assume contracts can receive every token safely. Keep the explorer finding separate from ownership proof.

Determine wallet or contract context

Use a trusted explorer to see whether code exists at the destination and whether the intended asset transfer matches the route. Do not assume contracts can receive every token safely.

Keep the explorer finding separate from ownership proof. If an address changes unexpectedly, stop. Do not send a smaller gambling payment as an experiment while destination ownership remains uncertain.

Save the generated instruction before signing and the transaction receipt after confirmation. Record amount, token contract, destination and chain in both stages. Use that pair for support without revealing private keys.

Preserve a pre-send and receipt pair

Save the generated instruction before signing and the transaction receipt after confirmation. Record amount, token contract, destination and chain in both stages.

Use that pair for support without revealing private keys. EIP-55 specifies a capitalization checksum for hexadecimal Ethereum addresses. The proposal describes encoding and validation but does not bind an address to a person, platform or supported network.

Record the named blockchain and asset before copying the destination because compatible chains may share address syntax. Check the current account instruction rather than an old screenshot. Do not infer network support from a 0x prefix.

What the official source supports

Ethereum Improvement Proposal 55 checksum specification: The specification supports using current wallet software to reject malformed mixed-case text and comparing the entire destination rather than a short visual prefix and suffix.

Where the source stops

It cannot detect a correctly checksummed attacker address, establish account ownership, distinguish every compatible network, reverse a transfer or state current deposit terms.

Make the documented decision

Generate the destination inside the authenticated account, preserve its chain context, validate the checksum and compare all characters after pasting into the sending wallet.

If an address changes unexpectedly, stop. Do not send a smaller gambling payment as an experiment while destination ownership remains uncertain.

Build the final verification sheet

Mixed-case Ethereum addresses can carry a checksum that catches many typing errors. A valid checksum says the text is internally consistent; it does not say who owns the address or whether the current payment route accepts it. Generate the destination inside the authenticated account, preserve its chain context, validate the checksum and compare all characters after pasting into the sending wallet. If an address changes unexpectedly, stop. Do not send a smaller gambling payment as an experiment while destination ownership remains uncertain.

Do not infer network support from a 0x prefix. A lowercase address may omit the checksum signal entirely. A matching beginning and ending is insufficient evidence. Keep the explorer finding separate from ownership proof. Use that pair for support without revealing private keys.

Run a final evidence review before acting

EIP-55 specifies a capitalization checksum for hexadecimal Ethereum addresses. The proposal describes encoding and validation but does not bind an address to a person, platform or supported network. Review these checkpoints in order: Identify the network before the string; Validate the checksum locally; Compare every character after paste; Determine wallet or contract context; Preserve a pre-send and receipt pair. Leave an unanswered item visibly unresolved instead of replacing it with a guess. It cannot detect a correctly checksummed attacker address, establish account ownership, distinguish every compatible network, reverse a transfer or state current deposit terms.

Identify the network before the string requires this evidence step: Record the named blockchain and asset before copying the destination because compatible chains may share address syntax. Do not infer network support from a 0x prefix. Validate the checksum locally requires this evidence step: Let reputable current wallet software parse the address and flag invalid mixed-case capitalization. A lowercase address may omit the checksum signal entirely. Compare every character after paste requires this evidence step: Read the full destination against the authenticated source after the clipboard operation. A matching beginning and ending is insufficient evidence. Determine wallet or contract context requires this evidence step: Use a trusted explorer to see whether code exists at the destination and whether the intended asset transfer matches the route. Keep the explorer finding separate from ownership proof. Preserve a pre-send and receipt pair requires this evidence step: Save the generated instruction before signing and the transaction receipt after confirmation. Use that pair for support without revealing private keys.

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