{
  "manageEntity": {
    "action": "Save",
    "entityId": "1454377598",
    "entityType": "Track",
    "nonce": "0x8f1d6ac8e2aa9b4847d6b15c7f691ff878a32b64bdf23a9c2feae0ee48b2955f",
    "signature": "0x56be0e7cbe9cad7ed2bc29446840e8c5318c16454d8bc51ea36e056c1b312b2e1a4777e94964b389422fc9e225b865bd8e19c5e0a7520eb094a029c129b21c4b1b",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}