{
  "manageEntity": {
    "action": "Save",
    "entityId": "306674",
    "entityType": "Track",
    "nonce": "0x16e14a70dff77a8979617db3c80ca73679b42a02fab78322eaf9ebab6e6c7068",
    "signature": "0x3c5d587f14b126458b2687eff53bc8f23974eac3632df19e309c0d326fcff7e61a4343bd8fe95059f69d2ee5e0c5f3be7c2f85e9c2a2c5b8aae7af13f421aa561c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}