{
  "manageEntity": {
    "action": "Save",
    "entityId": "412943",
    "entityType": "Track",
    "nonce": "0xf4eb944598ec266b67d9d4021716e1c8624091cb32016afd59a4ac4d1aa8037d",
    "signature": "0xd0a79ad1c5dad118011cfc9b063a50fc1ecfd591e92eefe97da5fc54d96fa7bf742f17b215e32a4b52f4e35f15cf196a5c5cb5781e5871d24035484306846f661c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}