{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "674724902",
    "entityType": "User",
    "nonce": "0x7056944da25669be713ed33690e51577f523659895195c5eb32c7d8ecd888c2f",
    "signature": "0xb6835fea0912b7eb39bf1e671fe315b2571b95ddd670db899cbd7281ba0ad83a3b491a0216ab5d9d2f9464e96bee19a792be376ef5784432bba923180fda29f81c",
    "signer": "0x1758E4c19d51A4463499D3d835bB3c27fA36BF2F",
    "userId": "123788456"
  }
}