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DCIPs/EIPS/eip-999.md

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Adding EIPs website fork with some Gem Updates
2023-04-05 16:02:54 +00:00
---
eip: 999
title: Restore Contract Code at 0x863DF6BFa4469f3ead0bE8f9F2AAE51c91A907b4
author: Afri Schoedon (@5chdn)
discussions-to: https://ethereum-magicians.org/t/eip-999-restore-contract-code-at-0x863df6bfa4/130
status: Withdrawn
type: Standards Track
category: Core
created: 2018-04-04
---
## Simple Summary
This document proposes to restore the contract code of the `WalletLibrary`
contract at `0x863DF6BFa4469f3ead0bE8f9F2AAE51c91A907b4` with a patched version.
The contract was accidentally self-destructed and renders a significant amount
of Ether inaccessible.
## Abstract
The `WalletLibrary` contract was used by the
[Parity Wallet](https://www.parity.io/) to reduce gas costs for users deploying
multi-signature wallets on the Ethereum blockchain. It contained basic
functionality such as confirming or revoking multi-signature transactions for
any wallet deployed that depends on this library. The
[accidental self-destruction](https://github.com/paritytech/parity/issues/6995)
of the library contract caused significant amounts of Ether and other assets
owned by many different parties to be inaccessible. This proposal suggests
restoring the `WalletLibrary` by a
[patched](https://github.com/parity-contracts/0x863df6bfa4) version to allow the
owners of the dependent multi-signature wallets regain access to their assets.
## Motivation
This proposal is necessary because the Ethereum protocol does not allow the
restoration of self-destructed contracts and there is no other simple way to
enable the affected users and companies regaining access to their tokens and
Ether. In opposite to previously discussed proposals, this will not change any
EVM semantics and tries to achieve the goal of unfreezing the funds by a single
state transition as specified in the next section.
## Specification
The self-destructed contract code at
[`0x863DF6BFa4469f3ead0bE8f9F2AAE51c91A907b4`](https://etherscan.io/address/0x863df6bfa4469f3ead0be8f9f2aae51c91a907b4#code)
shall be replaced with a patched version of the
[`walletLibrary.sol`](https://github.com/parity-contracts/0x863df6bfa4/blob/master/contracts/walletLibrary.sol)
as reviewed, tested, and approved in
[parity-contracts/0x863df6bfa4](https://github.com/parity-contracts/0x863df6bfa4):
```json
{
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"sourceMap": "2715:10853:0:-;;;3523:112;;;;;;;3552:18;3574:8;:27;;;;;;;;;;;:::i;:::-;;;;;;;;;;;3596:3;3574:27;;;;;;;;;;;;;;;;;;;;;;;3605:26;3616:8;3605:26;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;3626:1;3629;3605:10;;;;;:26;;;:::i;:::-;3523:112;;2715:10853;;7697:168;7585:1;7571:11;;:15;7567:26;;;7588:5;;;7567:26;7800:23;7813:9;7800:12;;;;;:23;;;:::i;:::-;7827:34;7842:7;7851:9;7827:14;;;;;:34;;;:::i;:::-;7595:1;7697:168;;;;:::o;6966:115::-;7585:1;7571:11;;:15;7567:26;;;7588:5;;;7567:26;7048:6;7033:12;:21;;;;7070:7;:5;;;;;:7;;;:::i;:::-;7058:9;:19;;;;7595:1;6966:115;;:::o;3977:349::-;4171:6;7585:1;7571:11;;:15;7567:26;;;7588:5;;;7567:26;4088:1;4076:9;:13;4068:22;;;;;;;;4120:9;4102:7;:14;:27;;4094:36;;;;;;;;4148:7;:14;4134:11;:28;;;;4180:1;4171:10;;4166:131;4187:7;:14;4183:1;:18;4166:131;;;4238:7;4246:1;4238:10;;;;;;;;;;;;;;;;;;4233:16;;4215:8;4228:1;4224;:5;4215:15;;;;;;;;;;;;:34;;;;;4291:1;4287;:5;4254:12;:30;4272:7;4280:1;4272:10;;;;;;;;;;;;;;;;;;4267:16;;4254:30;;;;;;;;;;;:38;;;;4166:131;4203:3;;;;;4166:131;;;4313:9;4300:10;:22;;;;7595:1;3977:349;;;;:::o;12529:73::-;12572:4;12593:6;12587:3;:12;;;;;;;;12580:19;;12529:73;;:::o;2715:10853::-;;;;;;;;;;;;;;;;;;;;;;;;;;;;:::i;:::-;;;;;:::o;:::-;;;;;;;;;;;;;;;;;;;;;;;;;;;:::o;:::-;;;;;;;",
"linkReferences": {}
}
```
To verify the byte-code above, a patched version is deployed at
[`0x21C9E434c669c4d73f55215A6F2130A185E127AC`](https://etherscan.io/address/0x21C9E434c669c4d73f55215A6F2130A185E127AC#code)
to be reviewed. The compiler settings used can be extracted from the following
meta-data:
```json
{"compiler":{"version":"0.4.10+commit.f0d539ae"},"language":"Solidity","output":{"abi":[{"constant":false,"inputs":[{"name":"_owner","type":"address"}],"name":"removeOwner","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_addr","type":"address"}],"name":"isOwner","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"m_numOwners","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"m_lastDay","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"resetSpentToday","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"m_spentToday","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_owner","type":"address"}],"name":"addOwner","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"m_required","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_h","type":"bytes32"}],"name":"confirm","outputs":[{"name":"o_success","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_newLimit","type":"uint256"}],"name":"setDailyLimit","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"},{"name":"_data","type":"bytes"}],"name":"execute","outputs":[{"name":"o_hash","type":"bytes32"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_operation","type":"bytes32"}],"name":"revoke","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_newRequired","type":"uint256"}],"name":"changeRequirement","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_operation","type":"bytes32"},{"name":"_owner","type":"address"}],"name":"hasConfirmed","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"ownerIndex","type":"uint256"}],"name":"getOwner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"}],"name":"changeOwner","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"m_dailyLimit","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"inputs":[],"payable":false,"type":"constructor"},{"payable":true,"type":"fallback"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"},{"indexed":false,"name":"operation","type":"bytes32"}],"name":"Confirmation","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"},{"indexed":false,"name":"operation","type":"bytes32"}],"name":"Revoke","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"oldOwner","type":"address"},{"indexed":false,"name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newOwner","type":"address"}],"name":"OwnerAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"oldOwner","type":"address"}],"name":"OwnerRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newRequirement","type":"uint256"}],"name":"RequirementChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_from","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"},{"indexed":false,"name":"value","type":"uint256"},{"indexed":false,"name":"to","type":"address"},{"indexed":false,"name":"data","type":"bytes"},{"indexed":false,"name":"created","type":"address"}],"name":"SingleTransact","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"owner","type":"address"},{"indexe
```
The differences to the originally deployed contract code can be reviewed at:
* [parity-contracts/0x863df6bfa4#2](https://github.com/parity-contracts/0x863df6bfa4/pull/2):
Remove the `selfdestruct()`
* [parity-contracts/0x863df6bfa4#3](https://github.com/parity-contracts/0x863df6bfa4/pull/3):
Initialize the library owner to `0x0`
The following sections propose two equivalent specifications, 999a and 999b,
which technically achieve the same results. To implement this proposal only one
of them has to be applied.
### Direct State Transition via Bytecode (999a)
At `CNSTNTNPL_FORK_BLKNUM`, directly recreate the account
`0x863DF6BFa4469f3ead0bE8f9F2AAE51c91A907b4` with the following parameters:
* Nonce: `0x1`
* Code:
```
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
```
* Storage:
* `0x0000000000000000000000000000000000000000000000000000000000000000`:
`0x0000000000000000000000000000000000000000000000000000000000000001`
* `0x0000000000000000000000000000000000000000000000000000000000000001`:
`0x0000000000000000000000000000000000000000000000000000000000000001`
* `0x0000000000000000000000000000000000000000000000000000000000000004`:
`0x00000000000000000000000000000000000000000000000000000000000044e1`
* `0xa5baec7d73105a3c7298203bb205bbc41b63fa384ae73a6016b890a7ca29ae2d`:
`0x0000000000000000000000000000000000000000000000000000000000000001`
The balance of the account shall be left unchanged.
### Alternate Specification via Codehash (999b)
At `CNSTNTNPL_FORK_BLKNUM`, directly recreate the account
`0x863DF6BFa4469f3ead0bE8f9F2AAE51c91A907b4` with the following parameters:
* Nonce: `0x1`
* Storage:
* `0x0000000000000000000000000000000000000000000000000000000000000000`:
`0x0000000000000000000000000000000000000000000000000000000000000001`
* `0x0000000000000000000000000000000000000000000000000000000000000001`:
`0x0000000000000000000000000000000000000000000000000000000000000001`
* `0x0000000000000000000000000000000000000000000000000000000000000004`:
`0x00000000000000000000000000000000000000000000000000000000000044e1`
* `0xa5baec7d73105a3c7298203bb205bbc41b63fa384ae73a6016b890a7ca29ae2d`:
`0x0000000000000000000000000000000000000000000000000000000000000001`
In addition, the codehash at that address shall be replaced by the codehash at
address `0x21C9E434c669c4d73f55215A6F2130A185E127AC`. The codehash is
`0x6209d55547da7b035d54ef8d73275e863d3072b91da6ace1614fa6381f4e2c09`. The
balance of the account shall be left unchanged.
## Rationale
The design decision to restore the `WalletLibrary` contract code in a single
state transition was made after lengthy discussions of
[alternate proposals](https://gist.github.com/5chdn/a9bb8617cc8523a030126a3d1c60baf3)
that explored different ways to improve the Ethereum protocol to allow contract
revivals by adding different built-in contracts. It was eventually concluded
that all of these proposals changing the EVM semantics around self-destructed
contracts were introducing unwanted side-effects and
[potential risks](https://medium.com/@weka/on-paritys-proposed-changes-to-selfdestruct-behaviour-c3f0e5bc0f49)
to the existing smart-contract ecosystem on the Ethereum platform.
The total supply of Ether is neither changed nor does this proposal require the
transfer of any tokens or assets including Ether. It is assumed that this change
is aligned with the interests both of (A) Parity Technologies that intended to
provide a smart-contracts library for multi-signature wallets to last forever
for its users and (B) the users of the multi-signature wallets that meant to
safely store their assets in a contract accessible any time they desire. Lastly,
the client-side implementation cost of this proposal is estimated to be low. A
sample implementation will be attached and linked in the following sections.
## Backwards Compatibility
This proposal introduces backwards incompatibilities in the state of the
contract at `0x863DF6BFa4469f3ead0bE8f9F2AAE51c91A907b4`. The Ethereum protocol
does not allow the restoration of self-destructed contracts. To implement this
on the Ethereum blockchain, it is recommended to add the necessary state
transition in a future hard-fork at a well-defined block number, e.g.,
`CNSTNTNPL_FORK_BLKNUM` for the Constantinople milestone which is supposed to be
the next scheduled hard-fork on the Ethereum road-map.
## Implementation
A proof-of-concept implementation is available for the Parity client on branch
[`a5-eip999-poc`](https://github.com/paritytech/parity/compare/a5-eip999-poc)
([#8406](https://github.com/paritytech/parity/pull/8406)). A sample chain
configuration for Parity can be found at the same branch in
[`multisig_test.json`](https://github.com/paritytech/parity/blob/891e633021eec78dd62104bf5a99af50f66b06c7/ethcore/res/ethereum/multisig_test.json#L38-L51)
describing the state change as specified above.
## Copyright
Copyright and related rights waived via [CC0](../LICENSE.md).