{
  "manageEntity": {
    "action": "Save",
    "entityId": "336252",
    "entityType": "Track",
    "nonce": "0x3bf13d18e5f6553e5cd59cf373d1cc118e74e9ca9b61a30651335bdc1fa7af20",
    "signature": "0x381a6fd9a0e4d9afa778dcb222f60ba1b41943414cd0d303b42b6bcc8426db2c28ad21b0c4a75a8c7836ea499d9bc8f2b63fd3c89c21b039a9d6c203ea3737e81b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}