{
  "manageEntity": {
    "action": "Save",
    "entityId": "464923",
    "entityType": "Track",
    "nonce": "0xeb680a433a98636807945aebbefc1c78bb75ba161a54642646667515f242a48b",
    "signature": "0x7d84726df79e609bde2075b3d68af1780582628c136713ac10452070754aa34f6c1bdd22657e43a24b9f476006c87ae3db3a71a12fe3c38152ca1a794d8b9cd21b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}