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EIP-779: Hardfork Meta: DAO Fork

Authors Casey Detrio (@cdetrio)
Created 2017-11-26
Requires EIP-606

Table of Contents

Abstract

This documents the changes included in the hard fork named “DAO Fork”. Unlike other hard forks, the DAO Fork did not change the protocol; all EVM opcodes, transaction format, block structure, and so on remained the same. Rather, the DAO Fork was an “irregular state change” that transferred ether balances from a list of accounts (“child DAO” contracts) into a specified account (the “WithdrawDAO” contract).

Specification

  • Codename: DAO Fork
  • Activation:
    • Block == 1,920,000 on Mainnet

See references [1] and [2] for the original, full specification. It is summarized here for convenience.

At block 1880000, the following accounts are encoded into a list L:

  • The DAO (0xbb9bc244d798123fde783fcc1c72d3bb8c189413)
  • its extraBalance (0x807640a13483f8ac783c557fcdf27be11ea4ac7a)
  • all children of the DAO creator (0x4a574510c7014e4ae985403536074abe582adfc8)
  • and the extraBalance of each child
Reference list L ``` 0xd4fe7bc31cedb7bfb8a345f31e668033056b2728, 0xb3fb0e5aba0e20e5c49d252dfd30e102b171a425, 0x2c19c7f9ae8b751e37aeb2d93a699722395ae18f, 0xecd135fa4f61a655311e86238c92adcd779555d2, 0x1975bd06d486162d5dc297798dfc41edd5d160a7, 0xa3acf3a1e16b1d7c315e23510fdd7847b48234f6, 0x319f70bab6845585f412ec7724b744fec6095c85, 0x06706dd3f2c9abf0a21ddcc6941d9b86f0596936, 0x5c8536898fbb74fc7445814902fd08422eac56d0, 0x6966ab0d485353095148a2155858910e0965b6f9, 0x779543a0491a837ca36ce8c635d6154e3c4911a6, 0x2a5ed960395e2a49b1c758cef4aa15213cfd874c, 0x5c6e67ccd5849c0d29219c4f95f1a7a93b3f5dc5, 0x9c50426be05db97f5d64fc54bf89eff947f0a321, 0x200450f06520bdd6c527622a273333384d870efb, 0xbe8539bfe837b67d1282b2b1d61c3f723966f049, 0x6b0c4d41ba9ab8d8cfb5d379c69a612f2ced8ecb, 0xf1385fb24aad0cd7432824085e42aff90886fef5, 0xd1ac8b1ef1b69ff51d1d401a476e7e612414f091, 0x8163e7fb499e90f8544ea62bbf80d21cd26d9efd, 0x51e0ddd9998364a2eb38588679f0d2c42653e4a6, 0x627a0a960c079c21c34f7612d5d230e01b4ad4c7, 0xf0b1aa0eb660754448a7937c022e30aa692fe0c5, 0x24c4d950dfd4dd1902bbed3508144a54542bba94, 0x9f27daea7aca0aa0446220b98d028715e3bc803d, 0xa5dc5acd6a7968a4554d89d65e59b7fd3bff0f90, 0xd9aef3a1e38a39c16b31d1ace71bca8ef58d315b, 0x63ed5a272de2f6d968408b4acb9024f4cc208ebf, 0x6f6704e5a10332af6672e50b3d9754dc460dfa4d, 0x77ca7b50b6cd7e2f3fa008e24ab793fd56cb15f6, 0x492ea3bb0f3315521c31f273e565b868fc090f17, 0x0ff30d6de14a8224aa97b78aea5388d1c51c1f00, 0x9ea779f907f0b315b364b0cfc39a0fde5b02a416, 0xceaeb481747ca6c540a000c1f3641f8cef161fa7, 0xcc34673c6c40e791051898567a1222daf90be287, 0x579a80d909f346fbfb1189493f521d7f48d52238, 0xe308bd1ac5fda103967359b2712dd89deffb7973, 0x4cb31628079fb14e4bc3cd5e30c2f7489b00960c, 0xac1ecab32727358dba8962a0f3b261731aad9723, 0x4fd6ace747f06ece9c49699c7cabc62d02211f75, 0x440c59b325d2997a134c2c7c60a8c61611212bad, 0x4486a3d68fac6967006d7a517b889fd3f98c102b, 0x9c15b54878ba618f494b38f0ae7443db6af648ba, 0x27b137a85656544b1ccb5a0f2e561a5703c6a68f, 0x21c7fdb9ed8d291d79ffd82eb2c4356ec0d81241, 0x23b75c2f6791eef49c69684db4c6c1f93bf49a50, 0x1ca6abd14d30affe533b24d7a21bff4c2d5e1f3b, 0xb9637156d330c0d605a791f1c31ba5890582fe1c, 0x6131c42fa982e56929107413a9d526fd99405560, 0x1591fc0f688c81fbeb17f5426a162a7024d430c2, 0x542a9515200d14b68e934e9830d91645a980dd7a, 0xc4bbd073882dd2add2424cf47d35213405b01324, 0x782495b7b3355efb2833d56ecb34dc22ad7dfcc4, 0x58b95c9a9d5d26825e70a82b6adb139d3fd829eb, 0x3ba4d81db016dc2890c81f3acec2454bff5aada5, 0xb52042c8ca3f8aa246fa79c3feaa3d959347c0ab, 0xe4ae1efdfc53b73893af49113d8694a057b9c0d1, 0x3c02a7bc0391e86d91b7d144e61c2c01a25a79c5, 0x0737a6b837f97f46ebade41b9bc3e1c509c85c53, 0x97f43a37f595ab5dd318fb46e7a155eae057317a, 0x52c5317c848ba20c7504cb2c8052abd1fde29d03, 0x4863226780fe7c0356454236d3b1c8792785748d, 0x5d2b2e6fcbe3b11d26b525e085ff818dae332479, 0x5f9f3392e9f62f63b8eac0beb55541fc8627f42c, 0x057b56736d32b86616a10f619859c6cd6f59092a, 0x9aa008f65de0b923a2a4f02012ad034a5e2e2192, 0x304a554a310c7e546dfe434669c62820b7d83490, 0x914d1b8b43e92723e64fd0a06f5bdb8dd9b10c79, 0x4deb0033bb26bc534b197e61d19e0733e5679784, 0x07f5c1e1bc2c93e0402f23341973a0e043f7bf8a, 0x35a051a0010aba705c9008d7a7eff6fb88f6ea7b, 0x4fa802324e929786dbda3b8820dc7834e9134a2a, 0x9da397b9e80755301a3b32173283a91c0ef6c87e, 0x8d9edb3054ce5c5774a420ac37ebae0ac02343c6, 0x0101f3be8ebb4bbd39a2e3b9a3639d4259832fd9, 0x5dc28b15dffed94048d73806ce4b7a4612a1d48f, 0xbcf899e6c7d9d5a215ab1e3444c86806fa854c76, 0x12e626b0eebfe86a56d633b9864e389b45dcb260, 0xa2f1ccba9395d7fcb155bba8bc92db9bafaeade7, 0xec8e57756626fdc07c63ad2eafbd28d08e7b0ca5, 0xd164b088bd9108b60d0ca3751da4bceb207b0782, 0x6231b6d0d5e77fe001c2a460bd9584fee60d409b, 0x1cba23d343a983e9b5cfd19496b9a9701ada385f, 0xa82f360a8d3455c5c41366975bde739c37bfeb8a, 0x9fcd2deaff372a39cc679d5c5e4de7bafb0b1339, 0x005f5cee7a43331d5a3d3eec71305925a62f34b6, 0x0e0da70933f4c7849fc0d203f5d1d43b9ae4532d, 0xd131637d5275fd1a68a3200f4ad25c71a2a9522e, 0xbc07118b9ac290e4622f5e77a0853539789effbe, 0x47e7aa56d6bdf3f36be34619660de61275420af8, 0xacd87e28b0c9d1254e868b81cba4cc20d9a32225, 0xadf80daec7ba8dcf15392f1ac611fff65d94f880, 0x5524c55fb03cf21f549444ccbecb664d0acad706, 0x40b803a9abce16f50f36a77ba41180eb90023925, 0xfe24cdd8648121a43a7c86d289be4dd2951ed49f, 0x17802f43a0137c506ba92291391a8a8f207f487d, 0x253488078a4edf4d6f42f113d1e62836a942cf1a, 0x86af3e9626fce1957c82e88cbf04ddf3a2ed7915, 0xb136707642a4ea12fb4bae820f03d2562ebff487, 0xdbe9b615a3ae8709af8b93336ce9b477e4ac0940, 0xf14c14075d6c4ed84b86798af0956deef67365b5, 0xca544e5c4687d109611d0f8f928b53a25af72448, 0xaeeb8ff27288bdabc0fa5ebb731b6f409507516c, 0xcbb9d3703e651b0d496cdefb8b92c25aeb2171f7, 0x6d87578288b6cb5549d5076a207456a1f6a63dc0, 0xb2c6f0dfbb716ac562e2d85d6cb2f8d5ee87603e, 0xaccc230e8a6e5be9160b8cdf2864dd2a001c28b6, 0x2b3455ec7fedf16e646268bf88846bd7a2319bb2, 0x4613f3bca5c44ea06337a9e439fbc6d42e501d0a, 0xd343b217de44030afaa275f54d31a9317c7f441e, 0x84ef4b2357079cd7a7c69fd7a37cd0609a679106, 0xda2fef9e4a3230988ff17df2165440f37e8b1708, 0xf4c64518ea10f995918a454158c6b61407ea345c, 0x7602b46df5390e432ef1c307d4f2c9ff6d65cc97, 0xbb9bc244d798123fde783fcc1c72d3bb8c189413, 0x807640a13483f8ac783c557fcdf27be11ea4ac7a ```

At the beginning of block 1920000, all ether throughout all accounts in L will be transferred to a contract deployed at 0xbf4ed7b27f1d666546e30d74d50d173d20bca754. The contract was created from the following Solidity code (compiler version v0.3.5-2016-07-01-48238c9):

// Deployed on mainnet at 0xbf4ed7b27f1d666546e30d74d50d173d20bca754

contract DAO {
    function balanceOf(address addr) returns (uint);
    function transferFrom(address from, address to, uint balance) returns (bool);
    uint public totalSupply;
}

contract WithdrawDAO {
    DAO constant public mainDAO = DAO(0xbb9bc244d798123fde783fcc1c72d3bb8c189413);
    address public trustee = 0xda4a4626d3e16e094de3225a751aab7128e96526;

    function withdraw(){
        uint balance = mainDAO.balanceOf(msg.sender);

        if (!mainDAO.transferFrom(msg.sender, this, balance) || !msg.sender.send(balance))
            throw;
    }

    function trusteeWithdraw() {
        trustee.send((this.balance + mainDAO.balanceOf(this)) - mainDAO.totalSupply());
    }
}

This contract is deployed on Mainnet in block 1883496 in transaction hash 0xfeae1ff3cf9b6927d607744e3883ea105fb16042d4639857d9cfce3eba644286. The deployment code of the contract is:

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

This deployment results in the runtime bytecode:

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

Blocks with block numbers in the range [1_920_000, 1_920_009] MUST have 0x64616f2d686172642d666f726b (hex encoded ASCII string dao-hard-fork) in the extraData field of the block.

References

  1. https://blog.slock.it/hard-fork-specification-24b889e70703
  2. https://blog.ethereum.org/2016/07/15/to-fork-or-not-to-fork/

Copyright and related rights waived via CC0.

Citation

Please cite this document as:

Casey Detrio (@cdetrio), "EIP-779: Hardfork Meta: DAO Fork," Ethereum Improvement Proposals, no. 779, November 2017. [Online serial]. Available: https://eips.ethereum.org/EIPS/eip-779.