{
  "manageEntity": {
    "action": "Save",
    "entityId": "155608",
    "entityType": "Track",
    "nonce": "0x7c1f695e1f1d2e6bfb6c9f42ad687bd3c88eead10d76e4dd94913b8410718f43",
    "signature": "0xfb2498fe5e05c3f60f3a4cc5f2504fb05c69c959c2d33052ef2421f8ff3fe0697e77317a1df7500c75aee0da24527b6f3b415eb62720e4fed76d8ab2993f55a81b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}