{
  "manageEntity": {
    "action": "Save",
    "entityId": "285943",
    "entityType": "Track",
    "nonce": "0x1b2893bcc7941e64715ed6412cee978ed95b921c0b5ddb8114c6423ea6f5b4f1",
    "signature": "0x4e1207d20085c4fd415c278899ce8150b7d77dba945975e6568118def54bf546139dd79a8e071e3b2c46e1643f65d0f09eee739c1e80a49340060fd127218ba51b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}