{
  "manageEntity": {
    "action": "Save",
    "entityId": "656399572",
    "entityType": "Track",
    "nonce": "0x13f85b6d3c624a4f42be32b07c9f7304598421e48829353f3be8595f79c49eeb",
    "signature": "0xd4c16bb937e98f85995408248dbfa40f175a5e237d36ef627d0bbfd9c0e9a07322d914183b697304dd777dacd6eadaa8277ac851b24734e049b062e2b7df0f6e1c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}