{
  "manageEntity": {
    "action": "Save",
    "entityId": "369475",
    "entityType": "Track",
    "nonce": "0x9f73c6a7de65a9faa92de56ef645be7a789764378a9cdd35afb732032d7f29e8",
    "signature": "0x6a8f695e97df9fc4ff9171376030176fbc18d5509287cf49ecb5d2937004fa9322c112d18b33164fed283767f50ed8d479123da10c20a9547e37263a0c97551a1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}