{
  "manageEntity": {
    "action": "Save",
    "entityId": "631513",
    "entityType": "Track",
    "nonce": "0x446425cc3c957131c64855ca258a53654f6d2990c581783868e8f5d68c1fad92",
    "signature": "0x422864b4f93533387107e0d21cdc11bf57829c2893a12298d9aa1b3a57679fcb46f449b97d7d33019c68d2f85d9379a92e8204c7bd1a36af4e09f34b1a19165d1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}