{
  "manageEntity": {
    "action": "Save",
    "entityId": "553747",
    "entityType": "Track",
    "nonce": "0x6b2279ad697d4dd550e0d8827027db849dda5e1f5373eaec76c709ab8bdcb7fa",
    "signature": "0xf035cf3e9b5c1d0dd73f32307a5f4350791d412bf10ba5e8aa1916aad6c671ed05fa5dec818b2a2f31ac1a6734fbcfab5686fd8b48cb8d09fefe35e6aa373cba1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}