{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "751278",
    "entityType": "User",
    "nonce": "0x9198688bd3514febf7c2a59704cef2d3a72ab765e2b6e52909de2a0577c17d7b",
    "signature": "0xb4ba4ee9a2520b8b5fc6ed4ae8e7d75e2b73e0981a8c3e3fecd3f8ff56b205b513b870f593b692bd45b475b5dbbd2d909ea2609c62e29b90cb546cad182884931c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}