PUSH0 instruction

The five-minute read

One action, walked through

1. Open EIP 3855 and read the status line before the examples.
2. Write down the rule in one sentence. A fair version of that sentence is: Introduce the PUSH0 (0x5f) instruction, which pushes the constant value 0 onto the stack.
3. Name the object that changes: PUSH0, RETURNDATA, PUSH1.
4. Ask what an old client, an old contract, or an offline counterparty does. If the document is silent, the silence is part of the design.

The argument, unpacked

What has to be true

• You are implementing EIP 3855 at the status the text itself states: Final.
• The object that has to change is PUSH0, RETURNDATA, PUSH1. A neighbouring document with a similar name is not this one.
• Status in the header is not adoption.

What happened after the paper

The source marks this final. That is a statement about the text, not a promise that every wallet or node has shipped it. Later documents can narrow, replace, or ignore this one. Cite the number you mean.

What to check before you use the idea

• What must an implementation of PUSH0 instruction accept, and what may it ignore?
• Is this consensus, peer policy, or an application interface?
• Which names does the text pin down: PUSH0, RETURNDATA, PUSH1?

Terms

EIP 3855

The public text titled PUSH0 instruction.

Final

The document's own label for how finished the text is. It is not a market fact.

The problem the paper names

An interface that is only a name in a repository will be re-implemented differently by every team, which is how shared contracts break.

What the design proposes

• Introduce the PUSH0 (0x5f) instruction, which pushes the constant value 0 onto the stack.
• Many instructions expect offsets as inputs, which in a number of cases are zero.
• A good example is the return data parameters of CALLs, which are set to zeroes in case the contract prefers using RETURNDATA.

How the mechanism is specified

• Taken from the specification, the next constraint is: Many instructions expect offsets as inputs, which in a number of cases are zero.
• Locate PUSH0, RETURNDATA, PUSH1 in EIP 3855 and apply it to one transaction or call.
• Then check the failure the class of rule always has: a node that did not upgrade, a reverted call, a replayed signature, or a peer that does not speak the message.

What this page does not treat as proven

• This document does not set a fee, a valuation, or a security proof.
• Status in the header is not adoption.
• The source marks this final. That is a statement about the text, not a promise that every wallet or node has shipped it.

Why a venture studio still reads it

Use EIP 3855 when a pitch says 'PUSH0 instruction' without saying whether the rule is consensus, policy, or an interface. The number is the citation. The pitch is not.