{
  "manageEntity": {
    "action": "Save",
    "entityId": "722985950",
    "entityType": "Track",
    "nonce": "0x564f6d6cb8765078a8081ec0627d9466530792740437c48177a7bddcd9d1e627",
    "signature": "0xd887d6c7173b29db05c52d686aa5cd7b0f7ae91bccf296811930271fd90a556255d0b55b7e4c5efb73ddc064e29366a80f1f74320a88ac1329c9d23ab25f27f61c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}