{
  "manageEntity": {
    "action": "Save",
    "entityId": "1873645110",
    "entityType": "Track",
    "nonce": "0x98232efeb7e6da712764c4c68fd5e9c6a8e01aa7affa77258ef35834289a690c",
    "signature": "0x97798bd7f8e0065124a051288fc8176109c6b631d0c8c22261837143a80e00e3475a5e6be1f90b212730ff948e90b0d480788739618373d412b8198594ec26d21c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}