{
  "manageEntity": {
    "action": "Save",
    "entityId": "689992922",
    "entityType": "Track",
    "nonce": "0x49b03978c1d6b0d5794d18fb85211c4dd11e603d87374a27f50441ff88539e70",
    "signature": "0xb24a2d08a9aa68b7d9f86570d039f92eceb5de049d8d5ec594a6b9e925dfdce45a673bf2c66b00f88a3e120405d0529c918478ada55a5c49e11168ad6dab40af1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}