Aurora Block Hashchain AIP #8
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joshuajbouw
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Mar 16, 2023
JonathanLogan
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Apr 3, 2023
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Sep 1, 2023
## Description This PR integrates the hashchain feature into the Aurora Engine contract (see aurora-is-near/AIPs#8). This change is fully backwards compatible because by default there is no hashchain present in the contract state and therefore no hashchain computation is done. The method to activate the hashchain is `start_hashchain` requires the contract to be paused and can only be called by a privileged account (I chose to use the key manager instead of introducing a new role). These restrictions are necessary because the hashchain is initialized with a value based on the Engine's transaction history (to enable validating Aurora blocks starting from the deployment of the contract). ## Performance / NEAR gas cost considerations After activating the hashchain there will be a small increase in gas usage because of the hashchain computation. It's not very much for most transactions (as seen in the performance regression tests), but the amount of gas is proportional to the size of the input + output of the transaction (because we compute a hash from this data). ## Testing The tests have been changed to enable the hashchain by default. Therefore all existing tests are running the hashchain code and testing that the Wasm and Standalone results match (this is important because the Refiner will be computing hashchain values off-chain using the Standalone Engine). An additional test has been added for the hashchain feature itself. ## Additional information Note: the diff in `contract_methods` is relatively large, but the code changes are minimal. All that happened is the existing function bodies were wrapped in `with_hashchain`, which changed the indentation. Viewing the PR with whitespace changes ignored may make this section easier to review.
aleksuss
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Sep 25, 2023
## Description This PR integrates the hashchain feature into the Aurora Engine contract (see aurora-is-near/AIPs#8). This change is fully backwards compatible because by default there is no hashchain present in the contract state and therefore no hashchain computation is done. The method to activate the hashchain is `start_hashchain` requires the contract to be paused and can only be called by a privileged account (I chose to use the key manager instead of introducing a new role). These restrictions are necessary because the hashchain is initialized with a value based on the Engine's transaction history (to enable validating Aurora blocks starting from the deployment of the contract). ## Performance / NEAR gas cost considerations After activating the hashchain there will be a small increase in gas usage because of the hashchain computation. It's not very much for most transactions (as seen in the performance regression tests), but the amount of gas is proportional to the size of the input + output of the transaction (because we compute a hash from this data). ## Testing The tests have been changed to enable the hashchain by default. Therefore all existing tests are running the hashchain code and testing that the Wasm and Standalone results match (this is important because the Refiner will be computing hashchain values off-chain using the Standalone Engine). An additional test has been added for the hashchain feature itself. ## Additional information Note: the diff in `contract_methods` is relatively large, but the code changes are minimal. All that happened is the existing function bodies were wrapped in `with_hashchain`, which changed the indentation. Viewing the PR with whitespace changes ignored may make this section easier to review.
birchmd
previously approved these changes
Oct 4, 2023
aleksuss
reviewed
Oct 4, 2023
birchmd
approved these changes
Oct 4, 2023
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AIP to introduce an additional block field for Aurora blockchain cryptographic verification.