{
  "manageEntity": {
    "action": "Save",
    "entityId": "144572",
    "entityType": "Track",
    "nonce": "0x89cdfa7c3a1957fbe641f67a7bc2c2bab6c46ae4e664e3a5fea03d5e11df54ac",
    "signature": "0xd5a7aa4c52124c7aaae54c0e166d464d284d371989ab6e83963b4876c454ba393beadf030ffbb5f88644e11dc4aa89594ee7a46619e7cc1cb69602f2903484d01c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}