{
  "manageEntity": {
    "action": "Save",
    "entityId": "544319",
    "entityType": "Track",
    "nonce": "0xe3eb0f1a6011caf791653de68428640c125ff3136e9372cc90b689b9df088065",
    "signature": "0xa5602ae58011913b4e62e46b24e3f24b8ecb71cd80ed5f03a9f7ac2dc4c09a8138ea809dc7033b7cc5640164a21ab4cab381b061a7bcde3d6df8179aaec146a01b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}