{
  "manageEntity": {
    "action": "Save",
    "entityId": "771769115",
    "entityType": "Track",
    "nonce": "0xf339e575cebbc422b7bcae1e6d6e332643803efd74a832b13000b9ec8ede791f",
    "signature": "0xe8b288ec9907b18372398e4a6f8a36de23df64fb76eac89a5f0aaaed3b0f065620663fab78e914c321387ca63cfa890e9583a7ea4cab44679be1f6bd4f326e511c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}