{
  "manageEntity": {
    "action": "Save",
    "entityId": "194663557",
    "entityType": "Track",
    "nonce": "0x76b4a0fe75dfe09e9045823274d7c9659bbd74276b7f772db99f38c41042a912",
    "signature": "0xb0c346d22250dba0b5c39aabf2b605c7f2c12504df8e0d6aa3488b57dec363c86080a571103f9faa12ab54c85b4e8160e25fff324979d068307bfb7ae137e9671c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}