{
  "manageEntity": {
    "action": "Save",
    "entityId": "665569",
    "entityType": "Track",
    "nonce": "0xaf07ada0e65567cb6056967c634f1211f8ba3ee6d67944bf6ca05bc121b7f1e3",
    "signature": "0x532dd3d8561e50d925ce66657cf20408ede0b912ca698db2548a37af306a7f013cf460e29913a3097310db79ce2323e2f7eb5a0fbff0b4c9471f166398a917ae1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}