{
  "manageEntity": {
    "action": "Save",
    "entityId": "370936070",
    "entityType": "Track",
    "nonce": "0x374d55629ece0f35003a0687a44933ca4655e6833ca9ce693cd2d070283f6f42",
    "signature": "0xcc17087caf1b51288d3a4628e34735169f86e26f62984bf3b9204253e062ed3527c1da5c467de6fe9bf9a3f84ac168db50fb9b13e984736e8024515ae736ccc01c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}