{
  "manageEntity": {
    "action": "Save",
    "entityId": "589358997",
    "entityType": "Track",
    "nonce": "0xb917896742d8bd4639533fae8c55d7ac2fecbefb9ab32789e24129f9e517b8d1",
    "signature": "0xe4856638036265257faf097912230dc1482a4674be62017f9c1aa7197f37551f6a23b339cf447004734ab2f29531c99ef963772a894c9b1722d359e9a3ede04d1b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}