{
  "manageEntity": {
    "action": "Save",
    "entityId": "135757",
    "entityType": "Track",
    "nonce": "0xfcc809af4d02cbdce0a65e239389af776e532941b808804c00481d0784abc3ce",
    "signature": "0x8dc561b0e16fdded56c549b7c45cfabf7f13e876907a36c9f201dc18c829cd493486885f37087d8be5f60efc6cf5108f46773cb0a9c34f4c29b4a5faf48c676f1c",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}