{
  "manageEntity": {
    "action": "Save",
    "entityId": "951017674",
    "entityType": "Track",
    "nonce": "0x14c8f3d75e0773361510e5d17695f7ac90945291b62f60c5d8068fba7e17167e",
    "signature": "0x815ce0b389ecd9319774a64c7d28bfc022e4e0bbc63c681da81adbcdc93f628e2601a8a5e8ec6a9bead9d13e53715870d46cd242f53801eebbead400cf67126b1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}