{
  "manageEntity": {
    "action": "Save",
    "entityId": "1564499856",
    "entityType": "Track",
    "nonce": "0x9db432e5823c277a353cd54e06a36370af6da7e32e7c4c9af1c2d6ce12e25170",
    "signature": "0xd53766b91ff90f07de60d9f8b379c270d999564160383ecd00095c70ed263d8912bc76a6940af10a53a289f85b6f15d0923c7ea2b10fd5b5bf93a01aa5910c8e1c",
    "signer": "0x48c57b64a5a12Dc7C7742Fdb629EEce52FF5591D",
    "userId": "930634116"
  }
}