{
  "manageEntity": {
    "action": "Save",
    "entityId": "1449377648",
    "entityType": "Track",
    "nonce": "0x06192c5fd5fe7995127a74188d1e997672fb70bbe84f9dbf6b51437d944407cd",
    "signature": "0xe1982dab11d24089cc9028ff656211345b0c0b9268b8cf55f56b39a2ba68c84c7848740bd8b53fb1662255d12ec34e6468b722b46ed40da11d6f7962caa41b691b",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}