{
  "manageEntity": {
    "action": "Save",
    "entityId": "984778889",
    "entityType": "Track",
    "nonce": "0xce8d92fcbf0aef09ed1dc9c7b7343c42c5e2107011ff23fcf79997be442c451a",
    "signature": "0x7bdfb3738fffd017a331a3eb725b99751d10c55b8e06c8db18c64504a877cf705e0f8c88327cc59167814c8d560296c3a06e4032bf741427c5a8c53cbae2c2d21b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}