{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "123439",
    "entityType": "User",
    "nonce": "0x8ed25272f7552f15eb36be7397cebece3b98dc69b464611fe148833802008fdf",
    "signature": "0xd6dc9bbc5a2d9517b6e2a4ebf0890b152fbdd1b34e5cf4ef8be791c823347f7627a909b19aa646183ec3c100e55612de5f7ae3e4680b6b37ec70319179f1ce3b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}