{
  "manageEntity": {
    "action": "Save",
    "entityId": "990464541",
    "entityType": "Track",
    "nonce": "0xca0b477b47dc69a25fb338fb5e3bb055ff54ea5039b8e23a32b2c5676ad8cc6f",
    "signature": "0xa48c55e53e673bf6ec6e8151972200f8a43393ab18780db76b94fe4e005a6a5e11ceb24b0d65f5cf604a06cb20b0f94992f66db9518049cb23762cb7f67523e21b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}