{
  "manageEntity": {
    "action": "Save",
    "entityId": "148518457",
    "entityType": "Track",
    "nonce": "0x4b01a8adbe3165bc3432587fb0eac200187216e072849a77b68ba93c436dc89c",
    "signature": "0x1dbecb3b29acfdc7437a157b842f05f7d775f0b38795e11b22e6264d71bd066e73267d70fb46a8a074211f675e4ae3e75b509091cc619676f4404c6d47c60c071c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}