{
  "manageEntity": {
    "action": "Save",
    "entityId": "379562324",
    "entityType": "Track",
    "nonce": "0x421c319df860b830fa8598a3558d32b5d01e8b09999dc4def99474c54d58de9e",
    "signature": "0xc56be33c1217ba931829b29a402cac22e8118dff8209806b356763afbe24d7635609cfb752e091ed2102880e1287b2b3801ac5a21754918c830bddc704528f671c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}