{
  "manageEntity": {
    "action": "Save",
    "entityId": "1154543748",
    "entityType": "Track",
    "nonce": "0x57d91560f577ab93b83b1e599905f808b8f60b49980919055e2c6b0af270cd83",
    "signature": "0x809317886601e9e6ecc510554db5da4e5e8a32682d76a5cf7e9ca3b2a34adffe7d5d756cd6d1f9064f9be0ff4207eb1e7d62beed8c2885f679285058b61f948f1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}