{
  "manageEntity": {
    "action": "Save",
    "entityId": "399383583",
    "entityType": "Track",
    "nonce": "0xa0b092ad6c4798284c234c8ce0c4b3ce14affe1040ad262b833a251092426af6",
    "signature": "0xc5c481b6abf09b36aa8f973d57db56786de85c413605839ec8ca0134e18f2d271317aa0588392399a7452de5d46041cc10a1b3a56fa84cdff355b3b6c873b3671b",
    "signer": "0x102a924C1c076Dcb5816d20E32Dcb6F00e75F2C9",
    "userId": "485987672"
  }
}