{
  "manageEntity": {
    "action": "Save",
    "entityId": "478713577",
    "entityType": "Track",
    "nonce": "0x8206dcce3e96c65bbeb0a3b27a3a7896e4bad2876f925372748d9426da3fd3f0",
    "signature": "0xe9e2708582958e87716c8d62572968981d2d6d68ce2a6eb19ead443a83344c5152be911db4c00cc1e99262813364c84302857d8599f3c62b2c1e912027b43ff51b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}