{
  "manageEntity": {
    "action": "Save",
    "entityId": "544578",
    "entityType": "Track",
    "nonce": "0x5ab6baa051531e727b61112b730b3c5f562fda02c74a1f599737b4f3f600669b",
    "signature": "0xd4a8e402b7f2a9d93af7bc1d141cbeb09410c718d4c69b173c811326346d5f525de0196ae0744c48129cbd082a55a063c1f95b7905e1728501f5186345adc0461b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}