{
  "manageEntity": {
    "action": "Save",
    "entityId": "544518",
    "entityType": "Track",
    "nonce": "0x4c592bba96087e32651cd0d85c142b53565c8c27f772c8a3d83d54523da91af0",
    "signature": "0xf2d7c14584817c44f7ab5a32a8e19cb4be00bfc2b9abc7e68b9e0def5ddbdad31bedef6d6ac30bf2954b1859cc6df82395430d0ba3968716f296b52880c9702f1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}