Other than looping through every transaction since the contract was mined is there a way to get every account that has interacted with a contract (or sent a transaction to an address) conveniently using the standard web3 API that will work for all browsers (Mist/Metamask/Parity)?
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1 Answer
I was facing exactly the same problem and the easiest solution I've found was to use the parity trace function:
web3.trace.filter({"fromBlock": "STARTING_BLOCK_NUMBER", "toAddress": [YOUR_CONTRACT_ADDRESS]}
Remember to start parity in an archive mode to be able to take advantage of the additional storage indexing:
parity --tracing on --pruning archive
answered Jul 10, 2017 at 11:46
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Okay, but is there a way to do it with the standard API that will also work with Metamask/Mist? Jul 10, 2017 at 16:20
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1Yes, but it's very inefficient as it requires browsing all of the transactions. That's why parity added indexing in tracing mode to speed up the search. Jul 10, 2017 at 16:26
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That is what I feared, would be great to see this functionality added to the general API. Jul 10, 2017 at 16:30
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@SamuelBarnes Jakub have reason with the general Api is really inefficient and you will have alot of problems with the asyncronous functions and the filters functionalities of the api. Try to use it or use other external api like the etherscan.io– GaweyJul 11, 2017 at 12:50
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@Gawey Centralised APIs are no good, the question asks if there is a way without looping. We understand there isn't. I have found a solution for my usecase which involves altering the contract design but is unfortunately a solution specific to the circumstance of the contract. Jul 11, 2017 at 16:04