{
  "manageEntity": {
    "action": "Save",
    "entityId": "954679",
    "entityType": "Track",
    "nonce": "0x8640c856befd1111390feb551dd9a993715529b93d02cfe1068db341ea8e382f",
    "signature": "0x5b5fc71a802755470216f3cae92a37d4227e91d3fc2c6741817607b74915451374adf2058662d290964de47b2f4cb3ccf5371644953a1be883eaab42f2c4e8781b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}