[Core] Sign block with staking key if coinstake is 'cold' stake
[Core] Sign block with staking key if coinstake is 'cold' stake

Darknet-Crypto/Darknet,Mrs-X/PIVX,Mrs-X/PIVX,PIVX-Project/PIVX,Mrs-X/Darknet,Mrs-X/PIVX,Darknet-Crypto/Darknet,Mrs-X/Darknet,Darknet-Crypto/Darknet,Darknet-Crypto/Darknet,Mrs-X/Darknet,PIVX-Project/PIVX,PIVX-Project/PIVX,Darknet-Crypto/Darknet,PIVX-Project/PIVX,Mrs-X/Darknet,Mrs-X/PIVX,Mrs-X/PIVX,PIVX-Project/PIVX,Mrs-X/PIVX,PIVX-Project/PIVX,Mrs-X/Darknet,Darknet-Crypto/Darknet,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,Mrs-X/Darknet