{
  "manageEntity": {
    "action": "Save",
    "entityId": "617902",
    "entityType": "Track",
    "nonce": "0x5905d689071e47537402ae0ef7ce96860930b95b427b2ccbd41047ed8dfea1b2",
    "signature": "0xd3052894dfb2ce1d25e3a86ab21e50e5a59ed4902a7d43265d1c3f04de7b3ed45d3e3bbc4f100e6afba1d9adca0bba8f26574fed84e6121cd8a21ffa20987b521c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}