{
  "manageEntity": {
    "action": "Save",
    "entityId": "600704",
    "entityType": "Track",
    "nonce": "0x9525dbd8d09368fc7288dcf65c1e7d23631c2bfc49a9cf87e79dbbdc173e187c",
    "signature": "0x97bf7137aa0bcfd028a412cad66e8b265791e1fca978d1d247615dd26f130eac6260f2b1422566f536e955a9ff38b7a5067938d204dfebecd81a3c036da5d4211c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}