{
  "manageEntity": {
    "action": "Save",
    "entityId": "1573799778",
    "entityType": "Track",
    "nonce": "0x6b5775169c48cd3b2b31ce1db1c6c5a431be67df1a56024a0495ef0a0737d2c2",
    "signature": "0x21dc4bf35e759846c4c47474e037346cc23f85fbdb8fca3dc87ffa52b34aaea13147d85be80671f76200a051857b13233aa7ada92f9337bc7b7d06682ccaa5011c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}