{
  "manageEntity": {
    "action": "Save",
    "entityId": "775907867",
    "entityType": "Track",
    "nonce": "0xb7b7a6be83e28c4cf78b09e3320fddbe4d13653501a3d72d92452a445eb206bd",
    "signature": "0x2e4e892e2605b3e9e8c4f23baeff68cef0246aeb7e615e6188950e441ece39b879467d9284c85c7d7d0e54eb396dd4c7f22480a15c57d7586c327fbb3a199f5a1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}