{
  "manageEntity": {
    "action": "Save",
    "entityId": "156657613",
    "entityType": "Track",
    "nonce": "0x190b3fea56d590ad5b3cf6f12c9db92eeac81320a6be248997c317c990fc9222",
    "signature": "0x914674568773c202ab7663dc3e9bb51cf321d5d95a5e0169ecd07f4ea76fc6d4677f4bbd8f2cc45fcbca13f533fc46692f068498520df78b58171c759dab5ba61c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}