{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0x49b2819eef8eee1e3c6aaf11263d8ea073ac930a911b9d5ab4f7bb051a0c1a34",
    "signature": "0xf66d8e52976c52fb4adfd74cc032153bb2070fd6f0568de33544d9885bd5771f5c46cd66d6c170317e22fdeb59d412d787375d45a886b7996833f22e2e7389811b",
    "signer": "0xa603e9487Ed7C3C62E8acb85f8f32acFf5d6349b",
    "userId": "278135553"
  }
}