{
  "manageEntity": {
    "action": "Save",
    "entityId": "1663747544",
    "entityType": "Track",
    "nonce": "0x1d79462f63b85b19bcb4a9f5ca6aa14895adc73d551f1e0dd5598a48c2ced22c",
    "signature": "0xed814101dcfd905fec64524c6ebbf44aad647cfda477e65fecabf472e3702c94215db4edfc33d6b8e3ceab1cd05c9f49f1991c86a3dafb2b1ca28dcb057ecd5b1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}