{
  "manageEntity": {
    "action": "Save",
    "entityId": "1004916",
    "entityType": "Track",
    "nonce": "0x0f99b2fe8735c5254ff9df68477569980d0980dc36085252ecff6f208f4294d9",
    "signature": "0x68ee7de12e8ab383086c200dd7b946aa1c23a4ff47fd60ca02805e8b3cf72ab91f944a645dff335272d937ddd91572660be18d579f6d2d43bcaff3f1f41890d41b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}