{
  "manageEntity": {
    "action": "Save",
    "entityId": "129516752",
    "entityType": "Track",
    "nonce": "0xbc5030d760896060b4d88a2124eab0075a20e7dbe3a0735d5f4f60314c4eb39f",
    "signature": "0x83b6550616278ce8ac59ab9962ee871e23bc1496efb7a4522a5ed4cb68d1429d27faf9925df3879e6722b620e2573544b52fe9d0ea4546197c570fd65bbe89d91c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}