Generic approach to fetching access-controlled keys for Provenance.
{
"public_signing_key": "0A21024D346A99201D31FCA89A7B8FD1F5AEC3B13E5A4B08FFE6A7C2174C7CC6C0B90D2001",
"private_signing_key": "0A20C637707D9E94E30EB10ED4CF914C1D9C863B17AFA68B97A1F6EDEF5E220AEB92",
"public_encryption_key": "0A210260CF86C34A828D0F147A707A4EF9CF3507FE03F456404051A7A65EE9CA62E2A82001",
"private_encryption_key": "0A207BBEEB9EEEEDF05AB12495EE93FD5C5CA29CD49FA99E347C7D2AFC957F83D9AA"
}