QUICK AND DIRTY BITCOIN ADDRESS MONITORING
(Posted 2018-01-05 20:23:53 by Julien Sansonnens)


Here is a solution that allows to quickly and easily monitor some bitcoin
addresses, so you can be notified when a transaction is made (receiving or
sending bitcoins). An email is sent when address balance has changed. This
solution written in bash has the advantage of not requiring the
installation of third party packages. Of course it's quick and dirty, do
not wait for a very elaborated code, but the work is done and that's the
main thing.


[code language="bash"]
adresse=$1
repertoire="$( cd "$( dirname "${BASH_SOURCE[0]}"
)" && pwd )"

if [ ! -f "$repertoire"/"$adresse".txt ]; then
        soldeactuel="$(wget -qO-
blockchain.info/rawaddr/"$adresse" 2>&1 | grep -Po
'"final_balance":\K[0-9]+' | awk '{s=$1/100000000} END {printf
"%0.8f\n", s}')"
        printf "$soldeactuel" >
"$repertoire"/"$adresse".txt
        exit
else
        anciensolde="$(cat
"$repertoire"/"$adresse".txt)"
        soldeactuel="$(wget -qO-
blockchain.info/rawaddr/"$1" 2>&1 | grep -Po
'"final_balance":\K[0-9]+' | awk '{s=$1/100000000} END {printf
"%0.8f\n", s}')"
        if [ $anciensolde != $soldeactuel ]
        then
               mail -s "Bitcoin monitored adress has changed"
somemail@somemail.com <<< "Bitcoin adress
"$adresse" just received a new transaction. Balance is now:
"$soldeactuel"" 
               printf "$soldeactuel" >
"$repertoire"/"$adresse".txt
        fi
fi
[/code]

usage: command somebitcoinaddress
to put in the crontab, for example every 15 minutes.

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