{
  "manageEntity": {
    "action": "Save",
    "entityId": "655429860",
    "entityType": "Track",
    "nonce": "0x122d4e0bd2676dde66cad055a0132e6209c4f7445fe3217324b3e7c09fdf96b4",
    "signature": "0xd19f7a5418f29c652e1d52f156aa5f7ee5e092d3987eac0d6fb0ce303b36759c0b702022ac356924b42b5ebbff70cd81ce6fffa5ec89040cce218d82db7d1d751b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}