{
  "manageEntity": {
    "action": "Save",
    "entityId": "155306",
    "entityType": "Track",
    "nonce": "0x1f900329f3e387d67581052c312b715bc964d83443fdb821d2ec376cb822f2c6",
    "signature": "0x9a80848c7f7db9c34180101206834ba466281c3638122608e87f64c93f676f451e8129d67d06594fbc7378d0223f8278b0abbd56a520ee388131d9174bd87c241c",
    "signer": "0x54A7bEEa4225786D727D79eDe3df2AaB446aC63A",
    "userId": "757958666"
  }
}