{
  "manageEntity": {
    "action": "Save",
    "entityId": "1253541231",
    "entityType": "Track",
    "nonce": "0x854e935aec30501f4f80e771cc0b0a685ac22d84230699d68bdbba87ba1df657",
    "signature": "0xdac67a94829c38b8ad5d45f94f1db5e905b4bf5a8b33bc0e614f2a19ac4433e073b5e9ccfe1e1b61c2c930258d5acd6135c9c04f6acbac773b33df8857edcd651c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}