{
  "manageEntity": {
    "action": "Save",
    "entityId": "251090",
    "entityType": "Track",
    "nonce": "0x7e57748b2688252631e08a78afa0861c6d1f415cbf8044f71db0f06a0f982d56",
    "signature": "0x2efbe44de8d1708cbd4dd0a9bdfebb6c47fc8517bb84bb33092956584bd38db8542e6a9b918f8b143041b5e537268ee4935ca28b2422e0399482225e29267a0b1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}