{
  "manageEntity": {
    "action": "Save",
    "entityId": "380273593",
    "entityType": "Track",
    "nonce": "1788164148850095631",
    "signature": "0xfe29be41e791be3f935cc9b28d934ac7ff7b167596a09f729d1d941bc813e3684c72da9818a567c66c4b2c3e02af16191f71b314796f211116c7d18f10936b4d1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}