{
  "manageEntity": {
    "action": "Save",
    "entityId": "1037862564",
    "entityType": "Track",
    "nonce": "0x26bc4fa4557010fba182447647cf37747aca0f91a7f15c36d4c7845c60518766",
    "signature": "0x3937e450debf9fd98b04817519b5702870f0b66466d1908c764729e550f170777de118291a89b4bb63983aff53c487af762e9b33a7c5cca77bcd10ff7918ecc71c",
    "signer": "0x1386f47791796D9eE653445d5eA6E520269F0D79",
    "userId": "388193"
  }
}