{
  "manageEntity": {
    "action": "Save",
    "entityId": "2141105345",
    "entityType": "Track",
    "nonce": "0xe353ab6a0ae99652339e7498ecd575622f23c58eee4a580f1781c4ed38b31626",
    "signature": "0x02b1e2be654f03882554bc7640b54baff8790f55cd6edb86b5b4253bc7dcb7b6399b3004d4088293e9c36db26bbbfb7a49e55f71940ef756bab71c88057ddbfc1b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}