{
  "manageEntity": {
    "action": "Save",
    "entityId": "266899367",
    "entityType": "Track",
    "nonce": "0x3c500b70c66d7f4000929b108ae37473e70e823a9868f4bf35904d6865eb2fb8",
    "signature": "0x30ea40245c5430034544ee8fb621e2b59ca846933f19ff5ceb5e6c5bc7900efa7194ff29c7954a865868ab64877c1ab5bdb979c96640506afff230b0f3531cd41c",
    "signer": "0x4a301B1531475818A969A2df9e99094AEf689Bc0",
    "userId": "38450038"
  }
}