{
  "manageEntity": {
    "action": "Save",
    "entityId": "1890880896",
    "entityType": "Track",
    "nonce": "0xd2888bd5fb6e031edb49902556f797c05c25e0b674e8e545cf64974953fe8fe5",
    "signature": "0x48cbc6091cb39d665955c2ab697c73d3f2ed8fa14e02236c7b61d65d9ee43b656719e1b5cdc04a68cfa3cbf557dfb24ba6e6540c5a0bbea4c6723d25cf84f1641b",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}