{
  "manageEntity": {
    "action": "Save",
    "entityId": "323681149",
    "entityType": "Track",
    "nonce": "0xa3f045eaf04dbf978759e0828f851b76f0b0ad7d7801526df3089e3badaeaa8b",
    "signature": "0xcf238a5aa0324c329d977d80edb439b83ae0581ae738a7f941285e3cfd12adf156e6b63dbed1b9f27b118388678121a253ccc3284c27693b06eb38d3f296ab221c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}