dumpprivkey "smileycoinaddress"
Reveals the private key corresponding to 'smileycoinaddress'.
Then the importprivkey can be used with this output
"smileycoinaddress" (string, required)
The smileycoin address for the private key
"key" (string) The private key
smileycoin-cli dumpprivkey "myaddress"
smileycoin-cli importprivkey "mykey"
curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "dumpprivkey", "params": ["myaddress"] }' -H 'content-type: text/plain;' http://127.0.0.1:9332/