{"action":"created","comment":{"url":"https://api.github.com/repos/ethereum/evm2.0-design/pulls/comments/73525565","id":73525565,"diff_hunk":"@@ -0,0 +1,29 @@\n+# Backward Compatibility\n+The current approach to achieving backwards compatibility with EVM1 is to\n+support both of the instruction sets with the option to transcompiling EVM1 to \n+EVM2. This approach gives clients optionality when dealing with EVM1 code.\n+A client can either implement only a WASM VM and transcompile all of the EVM1\n+code. Or a client can implement a wasm VM and EVM1 VM and leave the old code as\n+is.\n+\n+## Gas Prices\n+In eWASM we will introduce sub-gas units so that each EVM1 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If we can provided a way to do differential metering without added to much complexity then I think that would be ideal.","created_at":"2016-08-04T13:53:56Z","updated_at":"2016-08-04T13:53:56Z","html_url":"https://github.com/ethereum/evm2.0-design/pull/20#discussion_r73525565","pull_request_url":"https://api.github.com/repos/ethereum/evm2.0-design/pulls/20","_links":{"self":{"href":"https://api.github.com/repos/ethereum/evm2.0-design/pulls/comments/73525565"},"html":{"href":"https://github.com/ethereum/evm2.0-design/pull/20#discussion_r73525565"},"pull_request":{"href":"https://api.github.com/repos/ethereum/evm2.0-design/pulls/20"}}},"pull_request":{"url":"https://api.github.com/repos/ethereum/evm2.0-design/pulls/20","id":79976429,"html_url":"https://github.com/ethereum/evm2.0-design/pull/20","diff_url":"https://github.com/ethereum/evm2.0-design/pull/20.diff","patch_url":"https://github.com/ethereum/evm2.0-design/pull/20.patch","issue_url":"https://api.github.com/repos/ethereum/evm2.0-design/issues/20","number":20,"state":"closed","locked":false,"title":"added backwards compatibility 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