{
  "manageEntity": {
    "action": "Save",
    "entityId": "1438474256",
    "entityType": "Track",
    "nonce": "0x0d18d0e8389fcd87bbd2809c75bfe7674f7c530adbf78bbaa2268a70e7e3831c",
    "signature": "0x3caaa38a924202b64bf8d6d922b854b5fc02f6a028100a61da029005c59a04df2ac0aa899e04a49134406a55a26195694f65e74c6eb3ef19fefa040a22c41ec21c",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}