{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "21870",
    "entityType": "User",
    "nonce": "0xc57ef9ecd72662f1f036196464cc91866653a6f4acb65fe06f4255ecc01b47eb",
    "signature": "0xef6abea442c3163fa13563eaaed7bfa187d8300ad13c4d80e311d61b23eec5e3109e8be7bc3384191251ba0ea6d0c8743488623bd5ee37df98a063ed6b159de21c",
    "signer": "0xC7D69243b2161915036b32017e4FC8ea02d7faF1",
    "userId": "80378"
  }
}