2

How can data be encapsulated in an Ethereum transaction so that the block chain can record state of external system? Am I limited to using JavaScript type protocols?

Are tools provided for storing this sort of data?

3

You can put any arbitrary hexadecimal data in a transaction, in geth or web3.js just use

eth.sendTransaction({from: eth.accounts[0], to: recipientAddress, data: "0xabcd1234", gas: 100000})

You'll need to increase the gas as you increae the amount of data.

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