{
  "manageEntity": {
    "action": "Save",
    "entityId": "1948604462",
    "entityType": "Track",
    "nonce": "1792421391851218838",
    "signature": "0x2b40def10de5ca234c8d3a7703556586cb2d0e26e7ffb81f81708475cd9515fa2f7110d5c0dadcd5067f45affa20089a0d81430966f66220839837a1cde35ba11c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}