{
  "manageEntity": {
    "action": "Save",
    "entityId": "960881",
    "entityType": "Track",
    "nonce": "0x0363d1cf967375d4ced673e6be6f33a19364a2a4ecf3377c644fd5bcaee4a014",
    "signature": "0x9e66a7792ea017d29a3f94fb9a4137efa77e9e8b2c94558146bb7128c9f082f151716821e0c6f08e0581c2f0f4ab4798b25f4dba77e6de41da4f5c17e476c0b61c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}