{
  "manageEntity": {
    "action": "Save",
    "entityId": "465849",
    "entityType": "Track",
    "nonce": "0x16d8c02973ded47436dd3b09c116c3d25c05459b6ece2ae080d473238b5db2da",
    "signature": "0x61424d3fd9a4408f96541a029f897bfb16acfd79a5f11057ff5ded976c47523447a823720abe9f7d1256200bfc678aa489287888da7ebfea7acfb334a7fe2e481c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}