{
  "manageEntity": {
    "action": "Save",
    "entityId": "1915294129",
    "entityType": "Track",
    "nonce": "0x56130160adbfb48dc58b88137432a8dcbbba1d17717edf5e542ab2c2f5aa47f8",
    "signature": "0xc40e15cd54c3b18a9b88f314af4edc55c4b81654f0b7afd24f24f9762fc044c92b7b3aa2bd522b8fd5c65a25e71b8f91e4a4c47a99cc834a7c2bc41ddf6f04901c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}