{
  "manageEntity": {
    "action": "Save",
    "entityId": "385686753",
    "entityType": "Track",
    "nonce": "0x6c2e318c8355e3e6db9cf775ebcb2c3e884cf36643c399665bda4f2a8ff51a0f",
    "signature": "0xd9a18e9879eb57e7578be0f3731276b79b8a921809ba5bdfd1a1dea8111e6fd11284281691f7cf5d99f622ad135299e6409926fb33d1f34144c1f199b06249641b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}