{
  "manageEntity": {
    "action": "Save",
    "entityId": "1087018412",
    "entityType": "Track",
    "nonce": "0x91011ded44c2a616ffa2de72265d9f04272dfcc768f9c133981e1a31adce69c7",
    "signature": "0x7803c0326a405b2b837448dbf10c61bb2eb6a967471850e3481c0a00e5024f4325e0b97ec1a6d5a69886ea427e5b84f2daf259a1f9639aaff6c91bc82659b9b41b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}