{
  "manageEntity": {
    "action": "Save",
    "entityId": "687945265",
    "entityType": "Track",
    "nonce": "0xd3a3f57fa71c9f5b8eb4d2eebc5ee5cdd0b9b48f358fc9f00f448bdadf83ece0",
    "signature": "0x30cb162a2683f4a21db2487dfb1520b94c6d31d2dda3df7903cd6e92fc3585d4781b9fec5e59662e8c97f29733a31772cc69d565c4b51484a03c0d98102f6e151b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}