<p>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:
<a href="https://en.bitcoin.it/wiki/Original_Bitcoin_client/API_calls_list" rel="nofollow noreferrer">https://en.bitcoin.it/wiki/Original_Bitcoin_client/API_calls_list</a></p>

<p>"getreceivedbyaccount" or "getreceivedbyaddress" could do the jobe here.</p>

<p>Also, there are many blockchain "service" companies, which provide a web interface to look at the blockchain. For example:
<a href="https://blockchain.info/" rel="nofollow noreferrer">https://blockchain.info/</a></p>

<p>On the top right you can enter an address, and see if you have already transactions used with it. </p>

CC BY-SA 3.0
2017-04-09T12:48:16.167Z
maybe you should read my question one more time -- RPC INTERFACE OF BITCOIN CORE!!!!!!!
Otoma
CC BY-SA 3.0
2017-04-09T08:00:15.960Z
2017-04-09T08:00:15.960Z
pebwindkraft
<p>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?</p>

<bitcoin-core><address><json-rpc><bitcoin-cli>
Check if an address is new or has been used already
Otoma
# Check if an address is new or has been used already

(Asked by: username_0 on 2017-04-09)

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?

**Tags:** bitcoin-core, address, json-rpc, bitcoin-cli


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## 1 answers

### Answer by username_1 on 2017-04-09. Score: 1

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.

> **Comments:**
> **username_0**: maybe you should read my question one more time -- RPC INTERFACE OF BITCOIN CORE!!!!!!!  

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