{
  "manageEntity": {
    "action": "Save",
    "entityId": "638462579",
    "entityType": "Track",
    "nonce": "0x4720399b956d0b00d9328288c56bad2840c94988fe1cad5c83abc487aa53ef7a",
    "signature": "0x515c64ca80cf58b88fab64906b5d649481ccafaf79c80245af2a6cdef3b6c45374316998ef79d60688bfdf43691561d3468a2ce8b34bb820b48507b4030815451b",
    "signer": "0xA66d5981794A5e084FBD9adBFF28F465924fb9a9",
    "userId": "980224167"
  }
}