links.txt

Stackexchange:
https://ethereum.stackexchange.com/questions/75890/pros-and-cons-of-smart-contract-upgradable-patterns

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Data separation:
Trail of Bits:
https://blog.trailofbits.com/2018/09/05/contract-upgrade-anti-patterns/

https://medium.com/cardstack/upgradable-contracts-in-solidity-d5af87f0f913
https://medium.com/cardstack/upgradable-contracts-in-solidity-d5af87f0f913


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General philosophy:
https://consensys.github.io/smart-contract-best-practices/general_philosophy/

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memory layout problems and hints during upgrade:
https://github.com/OpenZeppelin/openzeppelin-sdk/issues/37

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ERC20 upgradeability problem:
https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
Read the trail of bits as well
https://blog.trailofbits.com/2018/09/05/contract-upgrade-anti-patterns/

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Proxy pattern implementation

https://blog.gnosis.pm/solidity-delegateproxy-contracts-e09957d0f201