{
  "manageEntity": {
    "action": "Save",
    "entityId": "1621793732",
    "entityType": "Track",
    "nonce": "0xcc6f1b8d2ef6597acfe87cfa5d301f369aad7417f728395aa94fc44c99ce57d5",
    "signature": "0xf51b3af92fe4917fc373c48a97ede5e8972f85dbb6956877a617d5a26800a4720f06296ef7c86cd4ec7d50a42e7c4b4d0b71ecf4524878e79b66f95de21d53b91b",
    "signer": "0xB1F7c19dc841aeAe6fbb5808f71BdE7094ce627E",
    "userId": "461761656"
  }
}