{
  "manageEntity": {
    "action": "Save",
    "entityId": "1326856171",
    "entityType": "Track",
    "nonce": "0x1754da922f68094fc3fc3111b35449ca758f4d0789a24158af08c1204f1871a8",
    "signature": "0x40d66c61a60b32a5ed7cbe4b7da7f64bb3be3bd1ceb44995dad69782620bd89d363569e21c076a7b68aa3e98bd241fc37124f003ca0777b1950d1fcebaf7dbe21b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}