{
  "manageEntity": {
    "action": "Save",
    "entityId": "16878",
    "entityType": "Track",
    "nonce": "0x858c624ff9cb55fa9555fa5ff2d5f6417fd3a581f5f8c2ab33c354efe561b152",
    "signature": "0xa6af597d7fa232330664362555bfdd619612f9ea8119e8b3762431dc8a87506c3886695dedd0dee11aee59d8cabb9d9acf5cc3d22051dc45406f3b17e32c16301c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}