{
  "manageEntity": {
    "action": "Save",
    "entityId": "508017",
    "entityType": "Track",
    "nonce": "0x502833aea291b2c0b1bcc5c5e0c6eaccfc50143092a7782d4a88d33c30c24bb6",
    "signature": "0xc4a166b4aab9ca15c3077260ff0895ff2925fdca3eb4cd7ae2d594c66df609183ee133fbe65e450276da70d91dc1b39d6018be7c5ce69a70a80ee572013590561c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}