{
  "manageEntity": {
    "action": "Save",
    "entityId": "867470820",
    "entityType": "Track",
    "nonce": "0x27a110e15f8bb4c4510fb707a152a9be8e0ab625331a80f4a27ab1d9ea19dd15",
    "signature": "0xce9cf3c88d65a44f3f09f5e9522c1881a9c295d02d46de10c7e1145669f106dc7b95b48ac043ce0cb77ab2d487f5688cd99d3beae0e4c6356a724b9c0c9144e91c",
    "signer": "0xaBca4973b8911Fb110a95E6e00e5BBFBCa671473",
    "userId": "832058678"
  }
}