{
  "manageEntity": {
    "action": "Save",
    "entityId": "254035742",
    "entityType": "Track",
    "nonce": "0x702e9b265e24504fd1e8eb0df4b4637609ecefc036d789b2a6fd7268e4ef0202",
    "signature": "0x557740281520eaea8ecaa2efa3500cc297a1fe942b0b5790640cfd451b68c21e4699c14d5c85b200195976708344c2d068ca06570d8afa70400b05384cdfccc41c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}