{
  "manageEntity": {
    "action": "Save",
    "entityId": "972995899",
    "entityType": "Track",
    "nonce": "0x93fbc198e3dd773c5dc843730d37468c1e073821aae623fb4558606773252ad8",
    "signature": "0x45637eba44976f711f9129f99abc9132032c148b7ff9127af4d7a1514e3fd7eb7b230a62dc2335d65eecb8ac2ea56a6fe0b04cfeed6e28c46dc5ba7c9c5d751c1c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}