{
  "manageEntity": {
    "action": "Save",
    "entityId": "604793913",
    "entityType": "Track",
    "nonce": "0x301130c38758ff09907836327853d346c916bedddb413acc3b92c14016af3df2",
    "signature": "0xa2b75f2981c56b9b3d879964d20f090478b409785d8819550b788df4b151e0a752f6eeabad49ead2dc72d46af68b2a0f3ea5e22370b301b960e06f4221bef5891b",
    "signer": "0x9FF2A7F5Fab732dA57359bb3eD63a95511bD1329",
    "userId": "67863854"
  }
}