{
  "manageEntity": {
    "action": "Save",
    "entityId": "2129231268",
    "entityType": "Track",
    "nonce": "0x495030819155ab3b9db7c455115c18ad13168bd31d730796d2140551d3cf9c79",
    "signature": "0xc4acd8c30b507a486231a0c6dae68f0d3af9bbc80ac9f844e99d30fa701bdd323a158c882dec563e5d7f1f6046278ffffda76db50b96870c992cd1a2be4033b61b",
    "signer": "0x18b5D7Cc922Ecc37bdB131b61E14eF5240cE064d",
    "userId": "744672373"
  }
}