{
  "manageEntity": {
    "action": "Save",
    "entityId": "1811904535",
    "entityType": "Track",
    "nonce": "0xe99e6d9d97288b5433cdc6f549af389e538f168766f9864c61b5e6c78f102ccd",
    "signature": "0x5702aa16f38a33c6926772380fb1cf8e991461d40b331e10b9e7918e5c36059d28763328cd5975e2419b735c23fae976142afd32905619a249d533e4014310221c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}