{
  "manageEntity": {
    "action": "Save",
    "entityId": "49357997",
    "entityType": "Track",
    "nonce": "0xf15371df1ae175dfecb89da780723d89b06fdd8851f5037127728257acd9c7e7",
    "signature": "0xe4bb981b089bf924e7e43681b86cf0e77de961221f90cc580d8217aafcc82b5440717395cb5d631b35cea939b78683c8e74e1afbf197b24662b23328893ccf011b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}