{
  "manageEntity": {
    "action": "Save",
    "entityId": "900690593",
    "entityType": "Track",
    "nonce": "0x69271d95830621c80e4d82f41b1fb09fed5ad823d3d6790e1580cb24d729c9d5",
    "signature": "0xc311a41b2ebc8c7d31ba45b9b0633625b054bd2633f7fb27a644b3b19e24dd6b6bc5ce52f95273d86e6cfed8eb5901fa964d3181078849f253b475d77c68816e1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}