{
  "manageEntity": {
    "action": "Save",
    "entityId": "1669614898",
    "entityType": "Track",
    "nonce": "0x416fa8a233398ca1f4515ed0601f7846d9d8f98dc65eec17fc44f165cc831de2",
    "signature": "0xccd0425f925f5657e2f4d69e49de043b23523279002ae1199156fa8d8e652c8420bb99dbe7c8effb8e48d1222945e83023ed58808ad44b81a504ca3f7f85c8fb1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}