{
  "manageEntity": {
    "action": "Save",
    "entityId": "390050971",
    "entityType": "Track",
    "nonce": "0x940b2e9c37bdfa4e2468b289f2165ea42e142bf775378b967c799a476097d0a3",
    "signature": "0xa123e2e70c8960e1e28086b3f5ec103d7fc5d327301703c17df8dfe569a5c5fb7e5507224f3a6440344fabb5fe5437744b4f26e92f05e8b7c1877d2f6e6643591c",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}