{
  "manageEntity": {
    "action": "Save",
    "entityId": "504962733",
    "entityType": "Track",
    "nonce": "0x42b58c26a6f1110bc2624d38b3d7bb1c14d2f3511be5b911f6db54f07d6375bd",
    "signature": "0xe3b24ee0a0f8a42f9d98fe5a6568b449e3ea56df12765f9016debf41cedbfac902204a876426740549fbe1f93936e2b1d3fd385f07c8cfa3e16cae80b6bc8b061c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}