{
  "manageEntity": {
    "action": "Save",
    "entityId": "1408374825",
    "entityType": "Track",
    "nonce": "0xbfb3d5a33170ca0df56ef193d1d1bcea1baac59af08a77fdbf413d5f2ba94e53",
    "signature": "0x0446459ebf1b98aadd01c358e579f1071723fd0e746ef3cdf1ecdb18696da8e7428e94e75e5c8c70fcf994ab0982af49c6bcfa0b923db6b8a016c535088804c71c",
    "signer": "0xDD3Cb841c7f19ec5581F8E2b14d6f7a58B92d0F7",
    "userId": "582464754"
  }
}