{
  "manageEntity": {
    "action": "Save",
    "entityId": "599613",
    "entityType": "Track",
    "nonce": "0x753913658fb4020faa0965a7d7439ad0ce183054a0f4b041775eae82150b7e61",
    "signature": "0x280b150260e5ba54b2d7cb4f72eb3c4d8edd4bf947661c4ed93c3bbd6d8583811581bda3cbaab78851a6bf4065f856d4c3befca5844aca2aa4e23c1c03ceddfb1c",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}