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I am coding an app where users can deposit ether into their accounts and do stuff with it (Im using web3.js and geth). However I would like to have everyone deposit into one single account, and then have a database that knows how much of the total pool of ether in the single account belongs to each person.

I was wondering if there was a feature in Ethereum where users would be able to send a message along side their transactions? So that a specific code could be given to the user who is making a deposite, and once the serverside code of the app sees the code, it can know who sent the ether.

QUESTION: Does this functionality or a similar one exist?

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web3.eth.sendTransaction(transactionObject [, callback])

If you are using above function for executing the transaction, then there is a parameter available in which you send some message along with transaction as well.

data: String - (optional) Either a byte string containing the associated data of the message, or in the case of a contract-creation transaction, the initialisation code.

This shall help you to send a message, along with a transaction.

Check this for more details - https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethsendtransaction

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