LibraryPrivacy2022Design paperCorpus record
Contract Resource Requests
ERC 5219. Gavin John.
ERC 5219, Contract Resource Requests. This EIP standardizes an interface to make resource requests to smart contracts and to receive HTTP-like responses.
Status in the source: Final. A reading of the public specification, not a copy of it and not a certification.
Contract Resource Requests is worth reading for the rule it actually adds: This EIP standardizes an interface to make resource requests to smart contracts and to receive HTTP-like responses.
The five-minute read
The rule
This EIP standardizes an interface to make resource requests to smart contracts and to receive HTTP-like responses.
What was already failing
A signature that does not commit to what the user saw can be replayed into a different spend, a different chain, or a different message.
What the number does not mean
The source marks this final. That is a statement about the text, not a promise that every wallet or node has shipped it.
What a builder should be able to point at
An implementation either constrains HTTP, MUST, NOT or it is a different design.
One action, walked through
- Open ERC 5219 and read the status line before the examples.
- Write down the rule in one sentence. A fair version of that sentence is: This EIP standardizes an interface to make resource requests to smart contracts and to receive HTTP-like responses.
- Name the object that changes: HTTP, MUST, NOT.
- 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 the text is allowed to settle
Ethereum Request for Comment 5219 can settle the shape of Contract Resource Requests. It cannot settle whether a later client, a later fork, or a later wallet still does this.
What this page will not pretend
There is no benchmark, no adoption number, and no claim that the mechanism is safe outside the assumptions written in the source.
What has to be true
- You are implementing ERC 5219 at the status the text itself states: Final.
- The object that has to change is HTTP, MUST, NOT. A neighbouring document with a similar name is not this one.
- Wallet support is not the same as consensus validity.
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 is covered by the signed bytes in Contract Resource Requests?
- Can the same signature be replayed on another chain, account, or message?
- Which primitive does the text require: HTTP, MUST, NOT?
Terms
- ERC 5219
- The public text titled Contract Resource Requests.
- Final
- The document's own label for how finished the text is. It is not a market fact.
The problem the paper names
A signature that does not commit to what the user saw can be replayed into a different spend, a different chain, or a different message.
What the design proposes
- This EIP standardizes an interface to make resource requests to smart contracts and to receive HTTP-like responses.
- Ethereum is the most-established blockchain for building decentralized applications (referred to as DApps).
- Due to this, the Ethereum DApp ecosystem is very diverse.
How the mechanism is specified
- Taken from the specification, the next constraint is: Ethereum is the most-established blockchain for building decentralized applications (referred to as DApps).
- Locate HTTP, MUST, NOT in ERC 5219 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
- A signature scheme is not a privacy system. It hides the signer only if the protocol says so.
- Wallet support is not the same as consensus validity.
- 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 ERC 5219 when a pitch says 'Contract Resource Requests' without saying whether the rule is consensus, policy, or an interface. The number is the citation. The pitch is not.
This is Blockchain Lab's reading of a public design paper. It is not the paper, not a copy of it, and not an offer of tokens, equity, custody or a partnership. Later network behaviour can diverge from the text. Nothing here is investment, legal or technical advice.
Research status: Design paper. Last reviewed: 1 October 2026. This is a reading of a public paper, not investment, legal or security advice.
