{
  "manageEntity": {
    "action": "Save",
    "entityId": "409593153",
    "entityType": "Track",
    "nonce": "0x014575be91ceaf41c986f7220296553d2bbba3f1fdf56c0349b0c9f8a5254309",
    "signature": "0xf1e830ac84259313245b36afe961224676bbc3683ea7832cce7ce21c4e421d04629099d918414aec011da891e86bb37ffbe0d051f946d329bfe5bf276413fb8f1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}