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Because LogNote is an anonymous event it is cheaper but on the other side you cannot filter it using a topic. See this already answered question for more details. Anyway, you can listen to all contract events and then filter in Javascript. DAI in fact has only 3 types of event: Transfer and Approval - with 3 parameters - and LogNote - with 4 parameters. ...


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Plese note that syncing optimization is up to clients, not to Ethereum, so each client implements its very own optimization method. When you say fast sync, I think you refer to geth. Fast sync is now the default sync mode for geth, and it is a way to prioritize objects you want to sync so you can start to work with the chain sooner. In particular, in geth's ...


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Fast sync nodes do have all TX receipts, hence all logs.


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