{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x8a77f033a6097e203804b5f49b9c4ccc34093f225b7f9fe1271e47ee65b84249",
    "signature": "0xa904dfab122c5b7bea9b19ea84375527317e528c918850cf61d3fc5267f6dce67732654d88aabf4ca89b52ecc69d141c93657e7b4973ca3307e8169ab23694881b",
    "signer": "0x3f900FCC34Df497be04653343010288eaf3B190f",
    "userId": "877657773"
  }
}