{
  "manageEntity": {
    "action": "Save",
    "entityId": "1016855894",
    "entityType": "Track",
    "nonce": "0xe8e2538c147510198e86304fe8e81292e6487faa7ee8908af3d46849b420737b",
    "signature": "0xf304313a2a3456463d56acff38c8b19166acfd447980759572e12e0e1fc0a63a7025a3046a163ddadf0ecc041bc26323ed41ab0da5319c741b77ea2479ecce5b1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}