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how to put some data (i want to put in. something like 'ABFFC1244AA') in Ethereum blockchain ?

as i know there is 'data' variable in transcation .

also if i can, want to know example or link for how to do it.

i make 'geth' network in ubuntu server.

and i can just make account , mining , send transaction ,,,

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Referring to the we3js document here for sendTransaction: http://web3js.readthedocs.io/en/1.0/web3-eth.html#sendtransaction

You may include a string as an optional parameter named data in sendTransaction. This data will be embedded in the transaction in the form of HEX. You will need to use web3.utils to convert it back to string for readability.

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