Hardfork Meta: DAO Fork

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

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

Copyright and related rights waived via CC0.