{
  "manageEntity": {
    "action": "Save",
    "entityId": "973664462",
    "entityType": "Track",
    "nonce": "0xbf9a029000c270a526028e347a66351a04557ad3167804426e021b6b6c4c290f",
    "signature": "0x943435054401d544ae557cbf7505dfbaefa6b6995e30b5f3d7ad1eeb03d61f3f4b910d65c704a9ccafa3bcfb03c1b3e800cf8e8dfe33245a1a7b7cffec4e024f1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}