{
  "manageEntity": {
    "action": "Save",
    "entityId": "629912394",
    "entityType": "Track",
    "nonce": "0xd49e49f49d2e4ab9632a70794abea36fec8eea0ea5028084c6425083968e4c51",
    "signature": "0xcf7356ef2ad3e7d2c950278c634fadbaa505230f77cbe73c987427cac1039d580702b19a2de876fe90064ee847b8e7ce2b65100ebcf593c9c48f98d257bae2411b",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}