{
  "manageEntity": {
    "action": "Save",
    "entityId": "685031260",
    "entityType": "Track",
    "nonce": "0x5f8718748706f3013eef574ea6c02dae035a427c2a80a1a4616725117020a551",
    "signature": "0x56a7893fb934b3a69f55410b935081e1261750407bef786f42ed105aaa4da5ac19379846b402c23ed4b9f3d1140bd0dbeb67a54e25fb0a77f0957919194506171c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}