{
  "manageEntity": {
    "action": "Save",
    "entityId": "1319908175",
    "entityType": "Track",
    "nonce": "0xbaf9bd20a8c5f9297905384e566e97a796a6a24b01125d95d86f5f3f5f9e3946",
    "signature": "0x7743e2f1fc5e4912fc2e36884fc7f2063e4f2573f0821b1009e76ecfa12119b070999565ec33a23355160f3199059e32d35cd7613ab45f5b59de60103282401e1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}