{
  "manageEntity": {
    "action": "Save",
    "entityId": "252575",
    "entityType": "Track",
    "nonce": "0x76e881b642435ece563c0ae0c0ad5247cb42c183f605696d203aeff6c700a99e",
    "signature": "0x6208094f091eb74f960dc67bb7b224390a3e4be5785bdf0bc8e10adfe8aa65f63e4ee40af628e06eebb2c303f336b5f705c6f3a61052a8acdf60c3620283f0361c",
    "signer": "0x421c447dE98aCed94A7e22093efd8C381503ca9D",
    "userId": "31637391"
  }
}