{
  "manageEntity": {
    "action": "Save",
    "entityId": "984605",
    "entityType": "Track",
    "nonce": "0x13865ffcf98d91803618c306acf20d8ebba44257a7b5b4f5c87bc88fc7513716",
    "signature": "0x430cf1d8f0aa16721cc21b4e3b60957a70994cd047ecb83dfe0e521d9230aaae5c866d2119dfbe7d36d6021d8150cf1bd7638d406fe65be0de3a28a85f99a9661b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}