{
  "manageEntity": {
    "action": "Save",
    "entityId": "1896573037",
    "entityType": "Track",
    "nonce": "0x1569a6cb3ae82dbdeaac3a2ef073f70585d7c5b9a4b3493c45f156957d393be7",
    "signature": "0xa2601a8f41915035113c9ceb3f2fb56524b80677ad2495c3b1944033b281a01654eb4607a964b769358cebb33eb5cc3cc016845d222533c9dae65ff04b6b400b1b",
    "signer": "0x21a7A27cB4B4662C0210B787b56aED1436642E2E",
    "userId": "645523947"
  }
}