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# EIPs [](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.
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# Contributing
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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 ).
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# 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.
# Accepted EIPs (planned for adoption)
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| Number |Title | Author | Layer | Status |
| ------------------------------------------------------- | ----------------------------------------------------------------------------------- | -------------------- | ------------| ----------|
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| [100 ](https://github.com/ethereum/EIPs/issues/100 ) | Change difficulty adjustment to target mean block time including uncles | Vitalik Buterin | Core | Accepted |
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| [140 ](https://github.com/ethereum/EIPs/pull/206 ) | REVERT instruction in the Ethereum Virtual Machine | Beregszaszi, Mushegian| Core | Accepted |
| [196 ](https://github.com/ethereum/EIPs/pull/213 ) | Precompiled contracts for addition and scalar multiplication on the elliptic curve alt_bn128 | Reitwiessner | Core | Accepted |
| [197 ](https://github.com/ethereum/EIPs/pull/212 ) | Precompiled contracts for optimal Ate pairing check on the elliptic curve alt_bn128 | Buterin, Reitwiessner | Core | Accepted |
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| [198 ](https://github.com/ethereum/EIPs/pull/198 ) | Precompiled contract for bigint modular exponentiation | Vitalik Buterin | Core | Accepted |
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| [211 ](https://github.com/ethereum/EIPs/pull/211 ) | New opcodes: RETURNDATASIZE and RETURNDATACOPY | Christian Reitwiessner| Core | Accepted |
| [214 ](https://github.com/ethereum/EIPs/pull/214 ) | New opcode STATICCALL | Buterin, Reitwiessner | Core | Accepted |
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| [649 ](https://github.com/ethereum/EIPs/pull/669 ) | Metropolis Difficulty Bomb Delay and Issuance Reduction | Schoedon, Buterin | Core | Accepted |
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| [658 ](https://github.com/ethereum/EIPs/pull/658 ) | Embedding transaction return data in receipts | Nick Johnson | Core | Accepted |
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# Deferred EIPs (adoption postponed)
| Number |Title | Author | Layer | Status |
| ------------------------------------------------------- | ----------------------------------------------------------------------------------- | -------------------- | ------------| ----------|
| [86 ](https://github.com/ethereum/EIPs/pull/208 ) | Abstraction of transaction origin and signature | Vitalik Buterin | Core | Deferred |
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| [96 ](https://github.com/ethereum/EIPs/pull/210 ) | Blockhash refactoring | Vitalik Buterin | Core | Deferred |
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# Finalized EIPs (standards that have been adopted)
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| Number |Title | Author | Layer | Status |
| ------------------------------------------------------- | ----------------------------------------------------------- | ----------------| ------------| --------|
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| [2 ](EIPS/eip-2.md ) | Homestead Hard-fork Changes | Vitalik Buterin | Core | Final |
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| [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 |
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| [141 ](EIPS/eip-141.md ) | Designated invalid EVM instruction | Alex Beregszaszi| Core | Final |
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| [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 |
| [170 ](EIPS/eip-170.md ) | Contract code size limit | Vitalik Buterin | Core | Final |
