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Say, I have an address. I can check if it's watch-only by calling validateaddress. Is there such an easy way to check it that address is new or has been used already?
Check if an address is new or has been used already
Answers
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maybe be a bit more specific, which client you use... I assume bitcoin core? In bitcoin core there is the command line interface (bitcoin-cli), that allows to send requests to the client. Specifications here: https://en.bitcoin.it/wiki/Original_Bitcoin_client/API_calls_list
"getreceivedbyaccount" or "getreceivedbyaddress" could do the jobe here.
Also, there are many blockchain "service" companies, which provide a web interface to look at the blockchain. For example: https://blockchain.info/
On the top right you can enter an address, and see if you have already transactions used with it.
maybe you should read my question one more time -- RPC INTERFACE OF BITCOIN CORE!!!!!!! – Otoma – 2017-04-09T12:48:16.167