{
  "manageEntity": {
    "action": "Save",
    "entityId": "1400608960",
    "entityType": "Track",
    "nonce": "0x5723ace57cf839285309b88177d0c35644fb5fb6b1fcf87c0e6e08e8523c5c65",
    "signature": "0x2049e42dbd9329abd5da645250e665a2854c817f30b3d9bc5c307b0e9e4d7222203d8b281bca9281cc6f2e0a9c8c6e06bc3069782a8f16f5d78a20a2f99d03b41c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}