{
  "manageEntity": {
    "action": "Save",
    "entityId": "1221419587",
    "entityType": "Track",
    "nonce": "0x966e3766ef1b9c81df948d3e76f331886cd235edb2d0acec6af3636c21c55d47",
    "signature": "0x404fdf2e7518498da2a109037b54dc7115e68dcebcaf531b23f57efe063f31245f6602e567b79b489203abcb3fdf55d93b53218ba3801339682b4e305d0d4cba1c",
    "signer": "0xAf1f176E32866fb97d822F6f5222061aF11ef652",
    "userId": "954117045"
  }
}