{
  "manageEntity": {
    "action": "Save",
    "entityId": "1889986385",
    "entityType": "Track",
    "nonce": "0x6df325ab01e6958d97f56e1577765f6ef7517f2cce5d64850fa0762e3cf7a820",
    "signature": "0x2dcf072d6d513e0a1130538fc13911c7e3221cdf8e12a5b2a67f8c21156079e103dd9537c8fde232a321f27ef9a1134d66bd895cc1c03a7d0ceb8e8d07f2e0901c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}