{
  "manageEntity": {
    "action": "Save",
    "entityId": "573898809",
    "entityType": "Track",
    "nonce": "0x4ce8d0258870a49c8b75ea7656d3b3027cdaebcae8fb5dbe9cf392ccbb101284",
    "signature": "0x3efdeab96e831b5742698be9e8727bdcf23a42b10ab5a193cf6d40a1dab0f48c168a14cd373a26a93232e205851b5a2d1ab6a58a9229e4c5862ba9d87bc6304e1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}