{
  "manageEntity": {
    "action": "Save",
    "entityId": "194238961",
    "entityType": "Track",
    "nonce": "0xaf933d44b045ae466d403c36a63ac55af8aaf84add5b1f533732512a628849d5",
    "signature": "0xf2418de7d8db035280d0556859e6e6d838124d0d05ca31225461190c476a32590172b0d381e0368abb46b89b2b89415cec35045f8f39a9bd33fde25a54996d361c",
    "signer": "0x380Fe18384267CA159c9Db6737B959099be2a515",
    "userId": "381292764"
  }
}