{
  "manageEntity": {
    "action": "Save",
    "entityId": "1654234388",
    "entityType": "Track",
    "nonce": "0xecd9cd01dc3d4e6e6477b7fed63cd317895e9a8cacfecfb263185a094804a021",
    "signature": "0x1cf2cd9bd9eb7e088cdce6ec427ca9b1d0631a8534c038698b98eb13994bffdd4c00fa1e44775fda5a7ecc298a27d655d6c3fa301e718b1ac5e93bcf024cdc681b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}