My smart contract address looks like this (altered): 0xb2dd088039f7b608b300e8fa14c2e0. Please advise if there is an Ethereum explorer in which private data can be shared by logging in through the smart contract address. Thanks.
Private blockchain is a peer-to-peer network of nodes, so nodes are subject of access control, rather than users of addresses. I'm not sure what kind pf private blockchain you are going to run, but for Quorum, you may control what nodes may connect to your network and what nodes may see a private transaction.