{
  "manageEntity": {
    "action": "Save",
    "entityId": "1287423571",
    "entityType": "Track",
    "nonce": "0xb4d979a2ac035d7e7ecb791904f6e0750d5966473b13c030fd038b51a910cdb0",
    "signature": "0xc1eba63569aa6e04567c438cc4ae68c67a0bd72f5a8f019faac2e2f5123b51046939b1430d0a90da141653d527c769d0c2af0922f4ea097e37d6e7f83034dc251b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}