{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0x1687f88fac6893b0d55d3ded523bd6e3d60a8ed8f8c5ccfa7dfb6a6eac5a1bec",
    "signature": "0x9ec591e73ad501c8e4cdd4d5094b5fcc59db8ef5d39a7eba9b3d06fc8d8679a81fa16fd0df20cff21e34338d644c9960a49261a95cc4f5fd1d7039d48d205b001b",
    "signer": "0x4b1A8281F6C7611C75f6c44f1D3B258B0143F613",
    "userId": "513956582"
  }
}