{
  "manageEntity": {
    "action": "Save",
    "entityId": "557535052",
    "entityType": "Track",
    "nonce": "0xfae5dc7d2290f6b1821c6c5804deed3b293f54aa59aeebfe0cdf21a291631216",
    "signature": "0x98780264a0ccb12e6719b44bdb380d79ce45d233b78462623789b2f8fb5515ae33071acae74cab3823e06abd19faa52295fc292266eb05e9abfc6795b163c4a31c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}