{
  "manageEntity": {
    "action": "Save",
    "entityId": "899334",
    "entityType": "Track",
    "nonce": "0x26474ba1bb6efac7a5fc6fef06e92f3b4a569fd12732fe5ca8787a7bf2379455",
    "signature": "0x1df707d93a67370462ee184ad894d535d6fe60a491e61712a084fc4cb78f635763acfed76945558c86ead950517d81335db99387ee30e0799fb36dbaf223cc581c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}