{
  "manageEntity": {
    "action": "Save",
    "entityId": "962398019",
    "entityType": "Track",
    "nonce": "1786364998342904887",
    "signature": "0x1d3f54a1864180f271db57860e8a4c96ca973756b4299705891360dca52253e12298675fe77fc8f408daa495c33af3ba72799649fa06414f037781eb6ba2b9cc1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}