{
  "manageEntity": {
    "action": "Save",
    "entityId": "157024909",
    "entityType": "Track",
    "nonce": "0x8895d18cb48841afbe15a5188e5ed64d7f28836a091e0f5a76ae8fc5d8cf76d8",
    "signature": "0xabb0df4b04c6308632054c389ff9ba9ba7c49571172477746ed4dc3fb53c3253362b6abfb33e4b3bc4db8ae03f6d1e2fe9ddc90828d840fde42528c98fa10e641c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}