{
  "manageEntity": {
    "action": "Save",
    "entityId": "1507485962",
    "entityType": "Track",
    "nonce": "0x1c9dd1e01b02e5bad60a529d38b5a4ae5e1c68c842b4e3091ba88b151b00c9fe",
    "signature": "0x31d2abb4107b6526c0602f8ab4ab269855c42bec50b42867f8c5db4ca414e5b31dd053b386608cfd42b0e615813159c275c23d17eddf0af5e75f975b43deb3dd1b",
    "signer": "0x796D60E9fE921C82Ef20f6329e27dD246392f542",
    "userId": "809803"
  }
}