{
  "manageEntity": {
    "action": "Save",
    "entityId": "592641584",
    "entityType": "Track",
    "nonce": "0xba95b74223b509e1786ef13f79a5818b1938b6814383ee5b7578b9ede5a5983a",
    "signature": "0x0f463a3d5c9330f91e9e1d0fcf23976a43e6fc78d9536e6306e103629bba95e942da28bb7af3aa67c4e4fb8d2f1c82c006cafad67cf8a36a9bfa8fefe7a55fc31c",
    "signer": "0x19EDB4c1a8740c323f6e57B80F3422C01875289e",
    "userId": "390804"
  }
}