{
  "manageEntity": {
    "action": "Save",
    "entityId": "830558",
    "entityType": "Track",
    "nonce": "0xc771557044ccd9851c36a6c1c20c46b1b0de3ffdae33e5906836e36c30d4b7fe",
    "signature": "0xab320d0d2402030bbc9ed3b5c7f7fe26ed804cda4b8a1406bf0ef3f685b809656874f091d88c810787a51d1318cd7895fba9efea4839a022dda8655884205e2c1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}