{
  "manageEntity": {
    "action": "Save",
    "entityId": "659742809",
    "entityType": "Track",
    "nonce": "0xc973879253632189ad3dd5d7525809ca26b505c6ba12f8c90f608ffc812d6eaa",
    "signature": "0x870ae302a1b3d6f98290f424e593323be81eb160b5473792989883d3f87b74234912b198b5e0c786623e38c21c16250011698dea6fe39d8e0608440e84920e811c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}