Upgradable smart contracts (proxy pattern)

[oberstet]

We should allow to upgrade our contract logic in the field (after deployment to mainnet):

• https://medium.com/quillhash/how-to-write-upgradable-smart-contracts-in-solidity-d8f1b95a0e9a

[oberstet]

after reviewing a couple of approaches, I think we should use OwnedUpgradeabilityProxy by OpenZeppelin. here are a couple of links:

• https://blog.openzeppelin.com/proxy-patterns/
• https://blog.openzeppelin.com/upgradeability-using-unstructured-storage/
• https://github.com/OpenZeppelin/openzeppelin-labs/blob/master/upgradeability_using_unstructured_storage/contracts/OwnedUpgradeabilityProxy.sol
• https://github.com/OpenZeppelin/openzeppelin-labs/blob/master/upgradeability_using_unstructured_storage/contracts/Proxy.sol
• https://github.com/OpenZeppelin/openzeppelin-labs/blob/master/upgradeability_using_unstructured_storage/contracts/UpgradeabilityProxy.sol

usage works like this:

networkProxy = OwnedUpgradeabilityProxy.new({ from: owner })
networkBehavior = XBRNetwork.new()
networkProxy.upgradeTo(networkBehavior.address, { from: owner })
network = XBRNetwork.at(networkProxy.address)

[oberstet]

• https://medium.com/coinmonks/a-practical-walkthrough-smart-contract-storage-d3383360ea1b
• https://programtheblockchain.com/posts/2018/03/09/understanding-ethereum-smart-contract-storage/
• https://solidity.readthedocs.io/en/v0.4.24/frequently-asked-questions.html?highlight=storage#what-is-the-memory-keyword-what-does-it-do

[oberstet]

• https://levelup.gitconnected.com/introduction-to-ethereum-smart-contract-upgradability-with-solidity-789cc497c56f