{
  "manageEntity": {
    "action": "Save",
    "entityId": "372688",
    "entityType": "Track",
    "nonce": "0x689d8b06b4578d4c3d12683b0d6c97d75b826355194e57927975510b962e29d6",
    "signature": "0x5e74e5390fd66573f9dab778163c4622f03b898c4b1575820494d9c6fdf5627a3e264180a930cee05daeb5b039736eb379061b4f85e75f4cc14826d9be23754e1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}