{
  "manageEntity": {
    "action": "Save",
    "entityId": "770224429",
    "entityType": "Track",
    "nonce": "0x11f02f2a4ba44fa0b0ee8ab9d396d990d039c89e573def2e3d8ee6d93a218742",
    "signature": "0x225bed485ec76fd26edbfbaff901f9330e398b6eebbde4041f17804b0b4b335f48fb5b77dfe0dc5367e31567e21792d91e27b9ae86180297e31d49ab515f865e1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}