EIPs/README.md

# EIPs [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/ethereum/EIPs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
Ethereum Improvement Proposals (EIPs) describe standards for the Ethereum platform, including core protocol specifications, client APIs, and contract standards.

# Contributing
First review [EIP-1](EIPS/eip-1.md). Then clone the repository and add your EIP to it. There is a [template EIP here](eip-X.md). Then submit a Pull Request to Ethereum's [EIPs repository](https://github.com/ethereum/EIPs).

# EIP status terms
* **Draft** - an EIP that is open for consideration
* **Accepted** - an EIP that is planned for immediate adoption, i.e. expected to be included in the next hard fork (for Core/Consensus layer EIPs).
* **Final** - an EIP that has been adopted in a previous hard fork (for Core/Consensus layer EIPs).
* **Deferred** - an EIP that is not being considered for immediate adoption. May be reconsidered in the future for a subsequent hard fork.

# Non-final EIPs
| Number                    | Title                                                   | Author                        | Layer     | Status     |
| ------------------------- | ------------------------------------------------------- | ----------------------------- | --------- | ---------- |
| [3](EIPS/eip-3.mediawiki) |  Addition of CALLDEPTH opcode                           | Martin Holst Swende           | Core      | Draft      |
| [4](EIPS/eip-4.mediawiki) |  EIP Classification                                     | Eric Lombrozo                 | Meta      | Draft      |
| [5](EIPS/eip-5.md)        |  Gas Usage for `RETURN` and `CALL*`                     | Christian Reitwiessner        | Core      | Draft      |
| [101](EIPS/eip-101.md)    |  Serenity Currency and Crypto Abstraction               | Vitalik Buterin               |           | Active     |
| [158](EIPS/eip-158.md)    |  State clearing                                         | Vitalik Buterin               | Core      | Superseded |
| [234](EIPS/eip-234.md)    |  Add `blockHash` to JSON-RPC filter options             | Micah Zoltu                   | Interface | Draft      |
| [615](EIPS/eip-615.md)    |  Subroutines and Static Jumps for the EVM               | Greg Colvin                   | Core      | Draft      |
| [616](EIPS/eip-EIPS/eip-616.md)    |  SIMD Operations for the EVM                            | Greg Colvin                   | Core      | Draft      |
| [758](EIPS/eip-758.md)    |  Subscriptions and filters for transaction return data  | Jack Peterson                 | Interface | Draft      |
| [801](EIPS/eip-801.md)    |  ERC-801 Canary Standard                                | ligi                          | Interface | Draft      |

# Deferred EIPs
| Number                                             | Title                                                                                        | Author                                     | Layer      | Status   |
| -------------------------------------------------- | -------------------------------------------------------------------------------------------- | ------------------------------------------ | ---------- | -------- |
| [86](https://github.com/ethereum/EIPs/pull/208)    | Abstraction of transaction origin and signature                                              | Vitalik Buterin                            | Core       | Deferred |
| [96](https://github.com/ethereum/EIPs/pull/210)    | Blockhash refactoring                                                                        | Vitalik Buterin                            | Core       | Deferred |
| [145](EIPS/eip-145.md)                             | Bitwise shifting instructions in EVM                                                         | Alex Beregszaszi, Paweł Bylica             | Core       | Deferred |

# Finalized EIPs (standards that have been adopted)
| Number                                             | Title                                                                                        | Author                                     | Layer      | Status   |
| -------------------------------------------------- | -------------------------------------------------------------------------------------------- | -------------------------------------------| ---------- | -------- |
| [1](EIPS/eip-1.md)                                 | EIP Purpose and Guidelines                                                                  | Martin Becze, Hudson Jameson               | Meta       | Final    |
| [2](EIPS/eip-2.md)                                 | Homestead Hard-fork Changes                                                                  | Vitalik Buterin                            | Core       | Final    |
| [6](EIPS/eip-6.md)                                 | Renaming Suicide Opcode                                                                      | Hudson Jameson                             | Interface  | Final    |
| [7](EIPS/eip-7.md)                                 | DELEGATECALL                                                                                 | Vitalik Buterin                            | Core       | Final    |
| [8](EIPS/eip-8.md)                                 | devp2p Forward Compatibility Requirements for Homestead                                      | Felix Lange                                | Networking | Final    |
| [20](EIPS/eip-20-token-standard.md)                | ERC-20 Token Standard                                                                        | Fabian Vogelsteller, Vitalik Buterin       | ERC        | Final    |
| [55](EIPS/eip-55.md)                               | ERC-55 Mixed-case checksum address encoding                                                  | Vitalik Buterin                            | ERC        | Final    |
| [100](https://github.com/ethereum/EIPs/issues/100) | Change difficulty adjustment to target mean block time including uncles                      | Vitalik Buterin                            | Core       | Final    |
| [137](EIPS/eip-137.md)                             | Ethereum Domain Name Service - Specification                                                 | Nick Johnson                               | ERC        | Final    |
| [140](https://github.com/ethereum/EIPs/pull/206)   | REVERT instruction in the Ethereum Virtual Machine                                           | Alex Beregszaszi, Nikolai Mushegian        | Core       | Final    |
| [141](EIPS/eip-141.md)                             | Designated invalid EVM instruction                                                           | Alex Beregszaszi                           | Core       | Final    |
| [150](EIPS/eip-150.md)                             | Gas cost changes for IO-heavy operations                                                     | Vitalik Buterin                            | Core       | Final    |
| [155](EIPS/eip-155.md)                             | Simple replay attack protection                                                              | Vitalik Buterin                            | Core       | Final    |
| [160](EIPS/eip-160.md)                             | EXP cost increase                                                                            | Vitalik Buterin                            | Core       | Final    |
| [161](EIPS/eip-161.md)                             | State trie clearing (invariant-preserving alternative)                                       | Gavin Wood                                 | Core       | Final    |
| [162](EIPS/eip-162.md)                             | ERC-162 ENS support for reverse resolution of Ethereum addresses                             | Maurelian, Nick Johnson                    | ERC        | Final    |
| [170](EIPS/eip-170.md)                             | Contract code size limit                                                                     | Vitalik Buterin                            | Core       | Final    |
| [181](EIPS/eip-181.md)                             | ERC-181 ENS support for reverse resolution of Ethereum addresses                             | Nick Johnson                               | ERC        | Final    |
| [190](EIPS/eip-190.md)                             | ERC-190 Ethereum Smart Contract Packaging Standard                                           | Merriam, Coulter, Erfurt, Catalano, Matias | ERC        | Final    |
| [196](https://github.com/ethereum/EIPs/pull/213)   | Precompiled contracts for addition and scalar multiplication on the elliptic curve alt_bn128 | Christian Reitwiessner                     | Core       | Final    |
| [197](https://github.com/ethereum/EIPs/pull/212)   | Precompiled contracts for optimal Ate pairing check on the elliptic curve alt_bn128          | Vitalik Buterin, Christian Reitwiessner    | Core       | Final    |
| [198](https://github.com/ethereum/EIPs/pull/198)   | Precompiled contract for bigint modular exponentiation                                       | Vitalik Buterin                            | Core       | Final    |
| [211](https://github.com/ethereum/EIPs/pull/211)   | New opcodes: RETURNDATASIZE and RETURNDATACOPY                                               | Christian Reitwiessner                     | Core       | Final    |
| [214](https://github.com/ethereum/EIPs/pull/214)   | New opcode STATICCALL                                                                        | Vitalik Buterin, Christian Reitwiessner    | Core       | Final    |
| [649](https://github.com/ethereum/EIPs/pull/669)   | Metropolis Difficulty Bomb Delay and Block Reward Reduction                                  | Afri Schoedon, Vitalik Buterin             | Core       | Final    |
| [658](https://github.com/ethereum/EIPs/pull/658)   | Embedding transaction return data in receipts                                                | Nick Johnson                               | Core       | Final    |
| [706](EIPS/eip-706.md)                             | DEVp2p snappy compression                                                                    | Péter Szilágyi                             | Networking | Final    |

# Past Hard Forks
| Codename                              | Aliases                     | Block number   | Date (UTC) |
|-------------------------------------- |---------------------------- |----------------|------------|
| [Homestead](EIPS/eip-606.md)          |                             | 1,150,000      | 2016-03-14 |
| [DAO Fork](EIPS/eip-779.md)           |                             | 1,920,000      | 2016-07-20 |
| [Tangerine Whistle](EIPS/eip-608.md)  | Anti-DoS, EIP 150           | 2,463,000      | 2016-10-18 |
| [Spurious Dragon](EIPS/eip-607.md)    | State-clearing, EIP 158/161 | 2,675,000      | 2016-11-22 |
| [Byzantium](EIPS/eip-609.md)          | Metropolis: Part 1          | 4,730,000      | 2017-10-16 |
redo table of EIPs in README 2017-03-03 17:14:28 +00:00			`# EIPs [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/ethereum/EIPs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)`
			`Ethereum Improvement Proposals (EIPs) describe standards for the Ethereum platform, including core protocol specifications, client APIs, and contract standards.`
Update README.md 2015-10-27 05:57:12 +00:00
Fixing few typos 2015-11-17 14:07:56 +00:00			`# Contributing`
Update README.md 2017-02-02 01:15:11 +00:00			`First review [EIP-1](EIPS/eip-1.md). Then clone the repository and add your EIP to it. There is a [template EIP here](eip-X.md). Then submit a Pull Request to Ethereum's [EIPs repository](https://github.com/ethereum/EIPs).`
Update README.md 2015-10-27 04:39:53 +00:00
redo table of EIPs in README 2017-03-03 17:14:28 +00:00			`# EIP status terms`
			`* Draft - an EIP that is open for consideration`
			`* Accepted - an EIP that is planned for immediate adoption, i.e. expected to be included in the next hard fork (for Core/Consensus layer EIPs).`
			`* Final - an EIP that has been adopted in a previous hard fork (for Core/Consensus layer EIPs).`
			`* Deferred - an EIP that is not being considered for immediate adoption. May be reconsidered in the future for a subsequent hard fork.`

List all non-final EIPs in README table 2018-01-03 19:45:38 +00:00			`# Non-final EIPs`
Move EIP-158 to non-final table 2018-01-03 19:57:05 +00:00			`\| Number \| Title \| Author \| Layer \| Status \|`
			`\| ------------------------- \| ------------------------------------------------------- \| ----------------------------- \| --------- \| ---------- \|`
			`\| [3](EIPS/eip-3.mediawiki) \| Addition of CALLDEPTH opcode \| Martin Holst Swende \| Core \| Draft \|`
			`\| [4](EIPS/eip-4.mediawiki) \| EIP Classification \| Eric Lombrozo \| Meta \| Draft \|`
			\| [5](EIPS/eip-5.md) \| Gas Usage for `RETURN` and `CALL*` \| Christian Reitwiessner \| Core \| Draft \|
			`\| [101](EIPS/eip-101.md) \| Serenity Currency and Crypto Abstraction \| Vitalik Buterin \| \| Active \|`
			`\| [158](EIPS/eip-158.md) \| State clearing \| Vitalik Buterin \| Core \| Superseded \|`
			\| [234](EIPS/eip-234.md) \| Add `blockHash` to JSON-RPC filter options \| Micah Zoltu \| Interface \| Draft \|
			`\| [615](EIPS/eip-615.md) \| Subroutines and Static Jumps for the EVM \| Greg Colvin \| Core \| Draft \|`
Fix link to EIP-616 2018-01-03 20:06:17 +00:00			`\| [616](EIPS/eip-EIPS/eip-616.md) \| SIMD Operations for the EVM \| Greg Colvin \| Core \| Draft \|`
Move EIP-158 to non-final table 2018-01-03 19:57:05 +00:00			`\| [758](EIPS/eip-758.md) \| Subscriptions and filters for transaction return data \| Jack Peterson \| Interface \| Draft \|`
			`\| [801](EIPS/eip-801.md) \| ERC-801 Canary Standard \| ligi \| Interface \| Draft \|`
List all non-final EIPs in README table 2018-01-03 19:45:38 +00:00
			`# Deferred EIPs`
Clean up formatting of README.md 2017-11-18 10:26:09 +00:00			`\| Number \| Title \| Author \| Layer \| Status \|`
			`\| -------------------------------------------------- \| -------------------------------------------------------------------------------------------- \| ------------------------------------------ \| ---------- \| -------- \|`
			`\| [86](https://github.com/ethereum/EIPs/pull/208) \| Abstraction of transaction origin and signature \| Vitalik Buterin \| Core \| Deferred \|`
			`\| [96](https://github.com/ethereum/EIPs/pull/210) \| Blockhash refactoring \| Vitalik Buterin \| Core \| Deferred \|`
			`\| [145](EIPS/eip-145.md) \| Bitwise shifting instructions in EVM \| Alex Beregszaszi, Paweł Bylica \| Core \| Deferred \|`
redo table of EIPs in README 2017-03-03 17:14:28 +00:00
			`# Finalized EIPs (standards that have been adopted)`
Clean up formatting of README.md 2017-11-18 10:26:09 +00:00			`\| Number \| Title \| Author \| Layer \| Status \|`
			`\| -------------------------------------------------- \| -------------------------------------------------------------------------------------------- \| -------------------------------------------\| ---------- \| -------- \|`
Add EIP-1 to the Finalized EIPs list 2018-01-16 05:14:59 +00:00			`\| [1](EIPS/eip-1.md) \| EIP Purpose and Guidelines \| Martin Becze, Hudson Jameson \| Meta \| Final \|`
Clean up formatting of README.md 2017-11-18 10:26:09 +00:00			`\| [2](EIPS/eip-2.md) \| Homestead Hard-fork Changes \| Vitalik Buterin \| Core \| Final \|`
			`\| [6](EIPS/eip-6.md) \| Renaming Suicide Opcode \| Hudson Jameson \| Interface \| Final \|`
			`\| [7](EIPS/eip-7.md) \| DELEGATECALL \| Vitalik Buterin \| Core \| Final \|`
			`\| [8](EIPS/eip-8.md) \| devp2p Forward Compatibility Requirements for Homestead \| Felix Lange \| Networking \| Final \|`
			`\| [20](EIPS/eip-20-token-standard.md) \| ERC-20 Token Standard \| Fabian Vogelsteller, Vitalik Buterin \| ERC \| Final \|`
Move EIP-158 to non-final table 2018-01-03 19:57:05 +00:00			`\| [55](EIPS/eip-55.md) \| ERC-55 Mixed-case checksum address encoding \| Vitalik Buterin \| ERC \| Final \|`
Clean up formatting of README.md 2017-11-18 10:26:09 +00:00			`\| [100](https://github.com/ethereum/EIPs/issues/100) \| Change difficulty adjustment to target mean block time including uncles \| Vitalik Buterin \| Core \| Final \|`
			`\| [137](EIPS/eip-137.md) \| Ethereum Domain Name Service - Specification \| Nick Johnson \| ERC \| Final \|`
			`\| [140](https://github.com/ethereum/EIPs/pull/206) \| REVERT instruction in the Ethereum Virtual Machine \| Alex Beregszaszi, Nikolai Mushegian \| Core \| Final \|`
			`\| [141](EIPS/eip-141.md) \| Designated invalid EVM instruction \| Alex Beregszaszi \| Core \| Final \|`
			`\| [150](EIPS/eip-150.md) \| Gas cost changes for IO-heavy operations \| Vitalik Buterin \| Core \| Final \|`
			`\| [155](EIPS/eip-155.md) \| Simple replay attack protection \| Vitalik Buterin \| Core \| Final \|`
			`\| [160](EIPS/eip-160.md) \| EXP cost increase \| Vitalik Buterin \| Core \| Final \|`
			`\| [161](EIPS/eip-161.md) \| State trie clearing (invariant-preserving alternative) \| Gavin Wood \| Core \| Final \|`
			`\| [162](EIPS/eip-162.md) \| ERC-162 ENS support for reverse resolution of Ethereum addresses \| Maurelian, Nick Johnson \| ERC \| Final \|`
			`\| [170](EIPS/eip-170.md) \| Contract code size limit \| Vitalik Buterin \| Core \| Final \|`
			`\| [181](EIPS/eip-181.md) \| ERC-181 ENS support for reverse resolution of Ethereum addresses \| Nick Johnson \| ERC \| Final \|`
			`\| [190](EIPS/eip-190.md) \| ERC-190 Ethereum Smart Contract Packaging Standard \| Merriam, Coulter, Erfurt, Catalano, Matias \| ERC \| Final \|`
			`\| [196](https://github.com/ethereum/EIPs/pull/213) \| Precompiled contracts for addition and scalar multiplication on the elliptic curve alt_bn128 \| Christian Reitwiessner \| Core \| Final \|`
			`\| [197](https://github.com/ethereum/EIPs/pull/212) \| Precompiled contracts for optimal Ate pairing check on the elliptic curve alt_bn128 \| Vitalik Buterin, Christian Reitwiessner \| Core \| Final \|`
			`\| [198](https://github.com/ethereum/EIPs/pull/198) \| Precompiled contract for bigint modular exponentiation \| Vitalik Buterin \| Core \| Final \|`
			`\| [211](https://github.com/ethereum/EIPs/pull/211) \| New opcodes: RETURNDATASIZE and RETURNDATACOPY \| Christian Reitwiessner \| Core \| Final \|`
			`\| [214](https://github.com/ethereum/EIPs/pull/214) \| New opcode STATICCALL \| Vitalik Buterin, Christian Reitwiessner \| Core \| Final \|`
			`\| [649](https://github.com/ethereum/EIPs/pull/669) \| Metropolis Difficulty Bomb Delay and Block Reward Reduction \| Afri Schoedon, Vitalik Buterin \| Core \| Final \|`
			`\| [658](https://github.com/ethereum/EIPs/pull/658) \| Embedding transaction return data in receipts \| Nick Johnson \| Core \| Final \|`
			`\| [706](EIPS/eip-706.md) \| DEVp2p snappy compression \| Péter Szilágyi \| Networking \| Final \|`
add table of HF meta-EIPs 2017-07-18 22:37:16 +00:00
			`# Past Hard Forks`
			`\| Codename \| Aliases \| Block number \| Date (UTC) \|`
			`\|-------------------------------------- \|---------------------------- \|----------------\|------------\|`
			`\| [Homestead](EIPS/eip-606.md) \| \| 1,150,000 \| 2016-03-14 \|`
Link to DAO Fork EIP 2018-01-03 18:10:31 +00:00			`\| [DAO Fork](EIPS/eip-779.md) \| \| 1,920,000 \| 2016-07-20 \|`
add table of HF meta-EIPs 2017-07-18 22:37:16 +00:00			`\| [Tangerine Whistle](EIPS/eip-608.md) \| Anti-DoS, EIP 150 \| 2,463,000 \| 2016-10-18 \|`
			`\| [Spurious Dragon](EIPS/eip-607.md) \| State-clearing, EIP 158/161 \| 2,675,000 \| 2016-11-22 \|`
			`\| [Byzantium](EIPS/eip-609.md) \| Metropolis: Part 1 \| 4,730,000 \| 2017-10-16 \|`