{
  "manageEntity": {
    "action": "Save",
    "entityId": "790296047",
    "entityType": "Track",
    "nonce": "0x5dfc7d00b9664fd54c9b19d660d44a9930c8bed5849934c64a9a1b790582e31e",
    "signature": "0x9d76737fea95b2ec6d2fc50a3fe790e5ff4789a5e1d339ddd6b0dfd202d13dd914ad44f45b39b65e49aef0633e2716f7ffeece7dc1c85dff3e147532d424c3e81b",
    "signer": "0x796D60E9fE921C82Ef20f6329e27dD246392f542",
    "userId": "809803"
  }
}