{
  "manageEntity": {
    "action": "Save",
    "entityId": "1963531855",
    "entityType": "Track",
    "nonce": "0xe2c3bf5cd76e7897067a7b349d249da90583427058f641dd829dc15a272b8b21",
    "signature": "0xa05e57193fb619b74e017892239d1454fd6507dacb7529c098e6edd73e4ff9006264209f6f13581de8e63d336b8a9172f93948abead21ef78742b40632bcb5f81c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}