{
  "manageEntity": {
    "action": "Save",
    "entityId": "290174",
    "entityType": "Track",
    "nonce": "0xb4f9eb1e9fc62a3c82d6b3de3dbbdd210fcfef766bcd5bae92390b75ea941921",
    "signature": "0x64a5acd2c2770a336f54e3cf274da685593986d637b0eb54d2216b66f035a7487990a0c84e055e998854c423834bf51f9a97ef22c14ea3df0c044a2947c811c61c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}