{
  "manageEntity": {
    "action": "Save",
    "entityId": "177588654",
    "entityType": "Track",
    "nonce": "0xcd7af779c19028bc7e6bbd7ec74356790f949eeb349f0386c2d202df67a426da",
    "signature": "0xd66febe14bb831ae154ffc7883eb98e01b6876097cb9a5ecc2262e50b16dbca3746b46c03203f6c176159d0a85a04889e32af962ce8b08741be035090829a4191b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}