{
  "manageEntity": {
    "action": "Save",
    "entityId": "329604",
    "entityType": "Track",
    "nonce": "0x0e53dc446bfb356fb978dde3ff450ce356fc72c7c6d616b9f9553ed08a5d6a40",
    "signature": "0x6f2373e5e8c84eb8d21523218fa4a7bdf39b7823b746198a1fdde1231fff16ec0454d7849c4046d901a1454e0f60d25745df027eab006eb4062cdbaa5e2665fe1c",
    "signer": "0x5D4848bCf5c4abA1a0Fdf2B61408c9e4288aDb0E",
    "userId": "305415280"
  }
}