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+## Preamble
+```
+EIP: 155
+Title: Simple replay attack protection
+Author: Vitalik Buterin
+Type: Standard Track
+Category: Core
+Status: Final
+Created: 2016-10-14
+```
+
+### Parameters
+- `FORK_BLKNUM`: TBA
+- `CHAIN_ID`: 1
+### Specification
+
+If `block.number >= FORK_BLKNUM` and `v = CHAIN_ID * 2 + 35` or `v = CHAIN_ID * 2 + 36`, then when computing the hash of a transaction for purposes of signing or recovering, instead of hashing only the first six elements (ie. nonce, gasprice, startgas, to, value, data), hash nine elements, with `v` replaced by `CHAIN_ID`, `r = 0` and `s = 0`. The currently existing signature scheme using `v = 27` and `v = 28` remains valid and continues to operate under the same rules as it does now.
+### Example
+
+Consider a transaction with `nonce = 9`, `gasprice = 20 * 10**9`, `startgas = 21000`, `to = 0x3535353535353535353535353535353535353535`, `value = 10**18`, `data=''` (empty).
+
+The "signing data" becomes:
+
+```
+0xec098504a817c800825208943535353535353535353535353535353535353535880de0b6b3a764000080018080
+```
+
+The "signing hash" becomes:
+
+```
+0xdaf5a779ae972f972197303d7b574746c7ef83eadac0f2791ad23db92e4c8e53
+```
+
+If the transaction is signed with the private key `0x4646464646464646464646464646464646464646464646464646464646464646`, then the v,r,s values become:
+
+```
+(37, 18515461264373351373200002665853028612451056578545711640558177340181847433846, 46948507304638947509940763649030358759909902576025900602547168820602576006531)
+```
+
+Notice the use of 37 instead of 27. The signed tx would become:
+
+```
+0xf86c098504a817c800825208943535353535353535353535353535353535353535880de0b6b3a76400008025a028ef61340bd939bc2195fe537567866003e1a15d3c71ff63e1590620aa636276a067cbe9d8997f761aecb703304b3800ccf555c9f3dc64214b297fb1966a3b6d83
+```
+### Rationale
+
+This would provide a way to send transactions that work on ethereum without working on ETC or the Morden testnet. ETC is encouraged to adopt this EIP but replacing `CHAIN_ID` with a different value, and all future testnets, consortium chains and alt-etherea are encouraged to adopt this EIP replacing `CHAIN_ID` with a unique value.
+
+
+### List of Chain ID's:
+
+| `CHAIN_ID`     | Chain(s)                                   |
+| ---------------| -------------------------------------------|
+| 1              | Ethereum mainnet                           |
+| 2              | Morden (disused), Expanse mainnet          |
+| 3              | Ropsten                                    |
+| 4              | Rinkeby                                    |
+| 30             | Rootstock mainnet                          |
+| 31             | Rootstock testnet                          |
+| 42             | Kovan                                      |
+| 61             | Ethereum Classic mainnet                   |
+| 62             | Ethereum Classic testnet                   |
+| 1337           | Geth private chains (default)              |