{
  "manageEntity": {
    "action": "Save",
    "entityId": "2119944392",
    "entityType": "Track",
    "nonce": "0x0e7211238d0612b433d3bed9b319093c5664a3a09aef37f9fcabafe5d8ad3693",
    "signature": "0x1e08abfb0bc6a0b6b2f2040c615ef3fdbda2e1cc5d0f914cef1a18eea67ad2d312c94198e554812a85ea3dcbbb8dbb471b54db0bbbec91a50d92d57742ab29b71b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}