{
  "manageEntity": {
    "action": "Save",
    "entityId": "657029950",
    "entityType": "Track",
    "nonce": "0x141355ec263bcaee69f51f0232b55028ea14d24f249275b223a1c67f845631c3",
    "signature": "0x8b9d805999443665d0944c76e9262b720e3e55253c8ab1982f259dfc2ed3598f053008e1622afb18ffe92f223a21ee0e6784fbec9fbff9d095ba6ab30502097c1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}