{
  "manageEntity": {
    "action": "Save",
    "entityId": "636651",
    "entityType": "Track",
    "nonce": "0x49c0bd64249c82b6032a685fb2c8ab589a99244f50ebecee7f8ab17f3fa02473",
    "signature": "0xcf7066045e607c377d890d7fa7ce2a0ff3af3cd94e68f0c7a98dfca2c4dc57cf5ef7cc3f26e07b03ca406c0c7ae60525d1026a1e5f49dab5f58b9589ae3c49c01c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}