{
  "manageEntity": {
    "action": "Save",
    "entityId": "902390895",
    "entityType": "Track",
    "nonce": "0x2fe26ed35d65792364994a5f2acd0bd4df4907eb9a94f57248312e5a60f5d050",
    "signature": "0x50e285613db77595435e2f99a8ec9e2dba5667e20f8f04d30ba7c7d4ba30a69e6dc04ea786f4ff368542892385e629097603e2643e28c11b4409ec72f66559c71b",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}