{
  "manageEntity": {
    "action": "Save",
    "entityId": "1621511265",
    "entityType": "Track",
    "nonce": "0x7f0f433de11122ae927e953bfa1c831898caf4f1bc06d1964e3fe8bb6abd515e",
    "signature": "0xb76fe5820a149b1f8f18260f0c67c65774deb9f11c8ff5806851b9faaad86a5520668891483613bcf27063e165de17540e0333d54b588e802a88237fbe3221291c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}