{
  "manageEntity": {
    "action": "Save",
    "entityId": "1401462565",
    "entityType": "Track",
    "nonce": "0x2a0cb8efc2a74566bcce9e446f4f56c0292e154f8d76d013b41633aa95da2290",
    "signature": "0x66ff0d7e97008ab1098cb2e2ab6d7a7faeff15df886e1356b04d7b595db6bcb43ff3b090ad33347a972dd4aa484953dfd806fffa866c23bff1022ae3893539791c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}