{
  "manageEntity": {
    "action": "Save",
    "entityId": "633499",
    "entityType": "Track",
    "nonce": "0x6b83b0c44e7c6e5c7a30a34b0a7b6b228e3c894397e532dd9ed123807faef377",
    "signature": "0x5ecc5e44339f7ab494333e67f2dc29327ccd5ce3ff721c093dcc9f7cc98f988a5249ca68dabeac6a49e33b22b8c078fe42d3a5840c9f15aa73daac8d07b7e9e11c",
    "signer": "0xE7Fc610afe51483AF4fB8fb5F981AC5843548D77",
    "userId": "117638061"
  }
}