{
  "manageEntity": {
    "action": "Save",
    "entityId": "137673088",
    "entityType": "Track",
    "nonce": "0x348d324333e8bfae19196228edcd3d2dab82aab98b8d05f5d4103825a19e7fb3",
    "signature": "0x7f7d8c0e2b85db5df8d5f5c3aa0f5599da538ae6461bfb34423c32e76426e94c48c8664f07872ee416ba196fd179c18c60be8aa008036f62810dc970748a1f9b1b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}