{
  "manageEntity": {
    "action": "Save",
    "entityId": "540917230",
    "entityType": "Track",
    "nonce": "0x9abd8fe3db6330eabda5439921b1c64a6aa8b8dbe809008d02f9b8b9f0296aee",
    "signature": "0xf8f9454c2417636d3f08cea5356036c11c5e6391c4911d213d6865abd1f9b1017e3869cca75ee657886ab5afaa25088e21df161235a12fd2731c21918ccef8581b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}