{
  "manageEntity": {
    "action": "Save",
    "entityId": "2004356960",
    "entityType": "Track",
    "nonce": "0x3d3c189fbcf996f1238956533aebc5d4b35b45d73e9b4127eebaf583a6db1740",
    "signature": "0x8cb13c8bd501ab90b8616eecf21c8cb63b36b4b175a4ed5909d288fcd35abf41078eaf90343893af38fd53a3036926d98e76b1a54520f5b00727febda03809301c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}