{
  "manageEntity": {
    "action": "Save",
    "entityId": "617530",
    "entityType": "Track",
    "nonce": "0x48440151b92f3c027a992dd4eac2a95ce3ede4f1cc8f70c579c7064f4decbf1b",
    "signature": "0x6639bab01257a62bc4e74fad110340a52838bdf6538430001c785342667d762763d72bcde875998091b6fb79d54db8d0b75c93a5f616e7c0beba2685f374d0701b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}