{
  "manageEntity": {
    "action": "Save",
    "entityId": "1950550860",
    "entityType": "Track",
    "nonce": "0xc0f3937010c303ec9aeaa216e68ece7aea5f7d9755f679ce8e9c2dc8be5209c0",
    "signature": "0x58b62b47513dde8927617d90578f55c2c878e8c3ba64955e33a70ffe4d01c44b3c3bd207ae81e2595d906657283d1bef66f90ff4a1edcb59bef9e4e1111c1de71b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}