{
  "manageEntity": {
    "action": "Save",
    "entityId": "2100750480",
    "entityType": "Track",
    "nonce": "0x46f75887a43a61ce52446da9d835feb3bf7da1795a38ebc1e83a2b91e10f2ec4",
    "signature": "0xe14c1fb4b2dba28d74b82871bdc3aa399c79f04f7ae75e1c837a8ea90754f1b45b5056b580fd818935a620b77ac236d0e4d2030d1360e45a0fba4c8ef6e8ccb31c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}