{
  "manageEntity": {
    "action": "Save",
    "entityId": "177842200",
    "entityType": "Track",
    "nonce": "0x768cc245882cee8cc26fe3aff141175f309ae52d34c0438fd7e5f09955db7a86",
    "signature": "0xce4261e1b23608ebe7ff859bb5e2bfb2cb89c6e60d4dc78c3c85a006f146aaa7373d9576051709e9ab7ebcf8cfd74ddb999523780f022a4082c2f9e5ee6ae6431c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}