{
  "manageEntity": {
    "action": "Save",
    "entityId": "1241244154",
    "entityType": "Track",
    "nonce": "0xc6ea5b68b912a6ffd480f0bebdd9c5e63abeca2d33e407c65909fbc9690fe01f",
    "signature": "0x2979c94f59f989a17aa2b2a16b3d7941ab9dfa44a0cebe205c21dfd8f6639e3f1fc4eb8bc885577e8a30adf8eea2efbc7568979e6d7301346344752c90dbb0221c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}