{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "819568368",
    "entityType": "User",
    "nonce": "0xd0f2e6b71aa8a930a299cbb25a69b913dde7b1a7a4d3dfa40cd35e0eafedc094",
    "signature": "0xb5f88ea08a33f1bc7b2638da9e2e9d40e9117ede6de7e2148b86c30403e14718518a1411e106f7a05ea92e04b98cb521c4a31a25fe1091e5c7998eee1a43e89c1b",
    "signer": "0x7cb443E1D882339Ce2Db89944ef44929E8E2F578",
    "userId": "343301"
  }
}