{
  "manageEntity": {
    "action": "Save",
    "entityId": "887434603",
    "entityType": "Track",
    "nonce": "1786032219015875475",
    "signature": "0x0f2a6ae23c5b90ecc405efbd3ab1df1be5f999545129c1671edd60cc21a9183463514c22ad2107377852392509399c49e86b17ebe292aee1190027e8cec4bc911b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}