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Update EIP-1052: fix eip-1052.md #9176

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Update EIP-1052: fix eip-1052.md #9176

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2 changes: 1 addition & 1 deletion EIPS/eip-1052.md
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---

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preamble is missing header(s): `description` 

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 = help: see https://ethereum.github.io/eipw/preamble-req/

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 = help: see https://ethereum.github.io/eipw/preamble-req/
eip: 1052
title: EXTCODEHASH opcode
author: Nick Johnson <[email protected]>, Paweł Bylica <[email protected]>

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4 | author: Nick Johnson <[email protected]>, Paweł Bylica <[email protected]>
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4 | author: Nick Johnson <[email protected]>, Paweł Bylica <[email protected]>
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created: 2018-05-02
requires: 161
---

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 = help: see https://ethereum.github.io/eipw/markdown-req-section/
## Abstract

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This EIP specifies a new opcode, which returns the keccak256 hash of a contract's code.

## Motivation

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Many contracts need to perform checks on a contract's bytecode, but do not necessarily need the bytecode itself. For instance, a contract may want to check if another contract's bytecode is one of a set of permitted implementations, or it may perform analyses on code and whitelist any contract with matching bytecode if the analysis passes.

Contracts can presently do this using the `EXTCODECOPY` (`0x3c`) opcode, but this is expensive, especially for large contracts, in cases where only the hash is required. As a result, we propose a new opcode, `EXTCODEHASH`, which returns the keccak256 hash of a contract's bytecode.
Expand Down Expand Up @@ -59,7 +59,7 @@
## Test Cases

1. The `EXTCODEHASH` of the account without code is `c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470`
what is the keccack256 hash of empty data.
what is the keccak256 hash of empty data.
2. The `EXTCODEHASH` of non-existent account is `0`.
3. The `EXTCODEHASH` of a precompiled contract is either `c5d246...` or `0`.
4. If `EXTCODEHASH` of `A` is `X`, then `EXTCODEHASH` of `A + 2**160` is `X`.
Expand All @@ -71,8 +71,8 @@
10. The `EXTCODEHASH` of an empty account that is going to be cleared by the state clearing rule.


## Implementation

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TBD

## Copyright

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Copyright and related rights waived via [CC0](../LICENSE.md).
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