{
  "manageEntity": {
    "action": "Save",
    "entityId": "1537434859",
    "entityType": "Track",
    "nonce": "0x4b316a5da63d9b29a39803971fc3532908245ca7f77dcb13f875340ed26d4321",
    "signature": "0x2354e26ea55f704db96fb050550b1f40ecf2cee877af7e1fc117b6b4738547d43328e7ddecafaf8007ce7ae7523690cc87005242fec13365663dd468e302373b1c",
    "signer": "0x46323bf87C45258bE3A40FA31E6e17cb9A9829Bd",
    "userId": "654087878"
  }
}