{
  "manageEntity": {
    "action": "Save",
    "entityId": "206440",
    "entityType": "Track",
    "nonce": "0x20ab172efb2d824ff0879965b38108be5764257a457efcf0e8a493702fe19e5c",
    "signature": "0xdc86e0ce61c812f0b10404ea0b372d21dd6c58c1be3545dcb2be32d0597265897b7519d453cdc9b7c1d89d39adda8721e7efc54280580e23c772b24eebae52c81c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}