{
  "manageEntity": {
    "action": "Save",
    "entityId": "1985703125",
    "entityType": "Track",
    "nonce": "0x8105293f55f71ca32d741fab1ece2a68c6bb74696d6caed5e1aba51c7c0446c8",
    "signature": "0x7b8b86aea9236cc30d36c38617a5fd7a17df88ceff1a90df8a23de15bfa1e0640fc80128ad4ecaabb3639e0230b1afe20bd4e296dc0b4484155e4a368b27da431b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}