{
  "manageEntity": {
    "action": "Save",
    "entityId": "604372703",
    "entityType": "Track",
    "nonce": "0xcba9c5bc9236d19921cabea4ae4a4f079dc38a3f00e90eb4ef13f52959dd261b",
    "signature": "0xf5f3deb662d26bfcbb813f982d18f58bdfce5cc8cfa28eedec8eb27d6b78e24760a6025e9a47bb18388fea079ef0da6abf2fd0f0453214366eef7f161f4c35241c",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}