{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x9b2c9432460f44a1281826e45737622b6e9a59d1a4179b40726f06b3916f2303",
    "signature": "0xce3f3f184f58d78509efc0f31691895566bb1ec1dc29a3c27f6110d7b259cf112b47591be78147027443e098d9dd2da7a93e7de5edbd303123e92f8b38177b7b1b",
    "signer": "0xd5420857f5870ea432EAe5E7D753F57537111F68",
    "userId": "123190169"
  }
}