{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "306603",
    "entityType": "User",
    "nonce": "0x3724f1362d7de5cc7cfd7947a2dfcab6aeb2b8e75400748237867faae1de694c",
    "signature": "0x073d78883b97f1604587221f04df3f0918197956f2b398b638cdd93bb11efde138b8c4cd5d85e96e360677ae4e6ef91790f5294abdd80b8875ce89b978b25c1e1c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}