{
  "manageEntity": {
    "action": "Save",
    "entityId": "1303455717",
    "entityType": "Track",
    "nonce": "0x1ac4df0fb46b69096240d3b2f45f02911c208beadcf89286611c361d2bd95a42",
    "signature": "0xd43b2d8bcae72a7ff687c688834a78e1c9599598977ab4fe2f5cdff9e19b65425e153937c0720e2ee1b8759879933bc620900561c00449b8787431677e1d81af1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}