{
  "manageEntity": {
    "action": "Save",
    "entityId": "1254360784",
    "entityType": "Track",
    "nonce": "0xc0974fa4b1d3a5b913113fd944fe423a19e341c8a355a98f8fccbdb788247e08",
    "signature": "0x368350702419d3b73a0042819621e7bddb10d88d12fb93134fb4fbbd576d4eb60ba9af2b74fcf8039c1d31f81dcac3ccea2fa533fdbf2b052a1cdc24f0389ac01c",
    "signer": "0xaFdEC27229de1023f5322f4Dbf0e874dC548011F",
    "userId": "817564020"
  }
}