{
  "manageEntity": {
    "action": "Save",
    "entityId": "1780684763",
    "entityType": "Track",
    "nonce": "0x7fb983dba2d8887d608a419e374ad2bd40a6f0da607a5f8a56025211b9151aec",
    "signature": "0x7cb35b419910ebf2be2376168306aff8fd090ec77ec00a14dbea732bdd4dc5f77af94cbab339e02e2dc32a02140cefce64a87207017f2c98b80a85a305997d091c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}