{
  "manageEntity": {
    "action": "Save",
    "entityId": "1337086234",
    "entityType": "Track",
    "nonce": "0x99251941c6f7b3841e758f91e3e1209084907abea0379e23c4d1549f044249ba",
    "signature": "0x7c3984843e595f2ed8d2ab0cf91853e322c7aa78ed11a7ac9bb317a073fd87833c8e442d428ad799797a2e4742e43029d49cea12a39c3de60a6eb628c79f65ec1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}