{
  "manageEntity": {
    "action": "Save",
    "entityId": "139081388",
    "entityType": "Track",
    "nonce": "0xde9c5d270f2b079a0909b27497c002f1c71706add5f8b4662c4581f663b28f80",
    "signature": "0x40a1dac6e74048acbbbb397738a4d8519ac555c7a4f7b931bdb3a8ab2fba67eb33dca1703ec5058139f620a3e2dbe2b8019923eeab8cee4b74da9cfb32e80ba81b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}